Css медиа запросы — примеры

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Variables in Media Queries

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CSS Properties

Свойство border в css

backface-visibility
background
background-attachment
background-blend-mode
background-clip
background-color
background-image
background-origin
background-position
background-repeat
background-size
border
border-bottom
border-bottom-color
border-bottom-left-radius
border-bottom-right-radius
border-bottom-style
border-bottom-width
border-collapse
border-color
border-image
border-image-outset
border-image-repeat
border-image-slice
border-image-source
border-image-width
border-left
border-left-color
border-left-style
border-left-width
border-radius
border-right
border-right-color
border-right-style
border-right-width
border-spacing
border-style
border-top
border-top-color
border-top-left-radius
border-top-right-radius
border-top-style
border-top-width
border-width
bottom
box-decoration-break
box-shadow
box-sizing
break-after
break-before
break-inside

caption-side
caret-color
@charset
clear
clip
clip-path
color
column-count
column-fill
column-gap
column-rule
column-rule-color
column-rule-style
column-rule-width
column-span
column-width
columns
content
counter-increment
counter-reset
cursor

direction
display
empty-cells
filter
flex
flex-basis
flex-direction
flex-flow
flex-grow
flex-shrink
flex-wrap
float
font
@font-face
font-family
font-feature-settings
font-kerning
font-size
font-size-adjust
font-stretch
font-style
font-variant
font-variant-caps
font-weight

gap
grid
grid-area
grid-auto-columns
grid-auto-flow
grid-auto-rows
grid-column
grid-column-end
grid-column-gap
grid-column-start
grid-gap
grid-row
grid-row-end
grid-row-gap
grid-row-start
grid-template
grid-template-areas
grid-template-columns
grid-template-rows

hanging-punctuation
height
hyphens
@import
isolation
justify-content
@keyframes
left
letter-spacing

line-height
list-style
list-style-image
list-style-position
list-style-type

margin
margin-bottom
margin-left
margin-right
margin-top
max-height
max-width
@media
min-height
min-width
mix-blend-mode

object-fit
object-position
opacity
order
outline
outline-color
outline-offset
outline-style
outline-width
overflow
overflow-x
overflow-y

padding
padding-bottom
padding-left
padding-right
padding-top
page-break-after
page-break-before
page-break-inside
perspective
perspective-origin
pointer-events
position
quotes

resize
right
row-gap

scroll-behavior

tab-size
table-layout
text-align
text-align-last
text-decoration
text-decoration-color
text-decoration-line
text-decoration-style
text-indent
text-justify
text-overflow
text-shadow
text-transform
top

transform
transform-origin
transform-style
transition
transition-delay
transition-duration
transition-property
transition-timing-function

unicode-bidi
user-select

vertical-align
visibility

white-space
width
word-break
word-spacing
word-wrap
writing-mode

z-index

Min Width to Max Width

Font

You can also use the values to set a minimum width and a maximum width.

For example, when the browser’s width is between 600 and 900px, change the
appearance of a <div> element:

Example

@media screen and (max-width: 900px) and (min-width: 600px) {  div.example {
font-size: 50px;    padding: 50px;
border: 8px solid black;    background: yellow; }}

Using an additional value: In the example below, we add an additional media query to our already
existing one using a comma (this will behave like an OR operator):

Example

/* When the width is between 600px and 900px OR above 1100px
— change the appearance of <div> */@media screen and (max-width: 900px) and (min-width:
600px), (min-width:
1100px) {  div.example {
font-size: 50px;    padding: 50px;
border: 8px solid black;    background: yellow; }}

Так что же лучше использовать?

Обращайте внимание на стандартный вариант отображения конкретного элемента. Если вам нужно переписывать стандартное состояние для меньших экранов, то используйте max-width

Если элемент можно использовать на меньших экранах и при стандартном состоянии, применяйте min-width только в тех случаях, когда элемент должен отличаться от стандартного состояния. И конечно же, я рекомендую вам позволить контенту определять, что и как должно происходить.

Таблицы – отличный пример использования CSS div max width для изменения стандартного состояния элемента, чтобы он лучше отображался на маленьких экранах. Представьте таблицу, контента в которой слишком много, чтобы отображать его полностью на маленьких устройствах. В таком случае мы можем применить следующий код:

@media only screen and (max-width: 30em) {
  .big-table tr,
  .big-table td {
    display: block;
  }
}

Этот код позволит нам преобразовать каждую строку (и ячейку) в блок. В результате таблица может стать длинной по вертикали, но зачастую это меньшее из зол. Я имею в виду длинные таблицы, которые приходится прокручивать по горизонтали. В таких ситуациях лучше всего оставить таблицы без изменений, за исключением кода для тех браузеров, которые понимают медиа-запросы, и случаев, когда ширина экрана не превышает определенного значения (30em в нашем случае).

Другие элементы, которые в стандартном состоянии отлично смотрятся на маленьких экранах, нужно изменять лишь по необходимости для экранов большего размера. В таких случаях и применяется min-width.

Вкратце: позвольте стандартному состоянию элементов помочь вам определить, какой медиа-запрос использовать.

Media Queries For Menus

In this example, we use media queries to create a responsive navigation menu, that varies
in design on different screen sizes.

Large screens:

Home
Link 1
Link 2
Link 3

Small screens:

Home
Link 1
Link 2
Link 3

Example

/* The navbar container */.topnav { overflow: hidden;
background-color: #333;}/* Navbar links */.topnav a {  float:
left;  display: block;  color:
white;  text-align: center;  padding: 14px 16px;
text-decoration: none;}
/* On screens that are 600px wide or less, make the menu links stack on top
of each other instead of next to each other */@media screen and (max-width: 600px) {

.topnav a {    float: none;    width:
100%;  }}

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Borders
Border Width
Border Color
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Border Shorthand
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CSS Margins
Margins
Margin Collapse

CSS PaddingCSS Height/WidthCSS Box ModelCSS Outline
Outline
Outline Width
Outline Color
Outline Shorthand
Outline Offset

CSS Text
Text Color
Text Alignment
Text Decoration
Text Transformation
Text Spacing
Text Shadow

CSS Fonts
Font Family
Font Web Safe
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Font Style
Font Size
Font Google
Font Pairings
Font Shorthand

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Table Borders
Table Size
Table Alignment
Table Style
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Float
Clear
Float Examples

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Navbar
Vertical Navbar
Horizontal Navbar

CSS DropdownsCSS Image GalleryCSS Image SpritesCSS Attr SelectorsCSS FormsCSS CountersCSS Website LayoutCSS UnitsCSS SpecificityCSS !important

Media Query Syntax

A media query consists of a media type and can contain one or more
expressions, which resolve to either true or false.

@media not|only mediatype and (expressions) { CSS-Code;}

The result of the query is
true if the specified media type matches the type of device the document is
being displayed on and all expressions in the media query are true. When a media query is true, the corresponding style sheet or style rules are
applied, following the normal cascading rules.

Unless you use the not or only operators, the media type is optional and the
type will be implied.

You can also have different stylesheets for different media:

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Colors
RGB
HEX
HSL

CSS Backgrounds
Background Color
Background Image
Background Repeat
Background Attachment
Background Shorthand

CSS Borders
Borders
Border Width
Border Color
Border Sides
Border Shorthand
Rounded Borders

CSS Margins
Margins
Margin Collapse

CSS PaddingCSS Height/WidthCSS Box ModelCSS Outline
Outline
Outline Width
Outline Color
Outline Shorthand
Outline Offset

CSS Text
Text Color
Text Alignment
Text Decoration
Text Transformation
Text Spacing
Text Shadow

CSS Fonts
Font Family
Font Web Safe
Font Fallbacks
Font Style
Font Size
Font Google
Font Pairings
Font Shorthand

CSS IconsCSS LinksCSS ListsCSS Tables
Table Borders
Table Size
Table Alignment
Table Style
Table Responsive

CSS DisplayCSS Max-widthCSS PositionCSS OverflowCSS Float
Float
Clear
Float Examples

CSS Inline-blockCSS AlignCSS CombinatorsCSS Pseudo-classCSS Pseudo-elementCSS OpacityCSS Navigation Bar
Navbar
Vertical Navbar
Horizontal Navbar

CSS DropdownsCSS Image GalleryCSS Image SpritesCSS Attr SelectorsCSS FormsCSS CountersCSS Website LayoutCSS UnitsCSS SpecificityCSS !important

Add a Breakpoint

Earlier in this tutorial we made a web page with rows and columns, and it
was responsive, but it did not look good on a small screen.

Media queries can help with that. We can add a breakpoint where
certain parts of the design will behave differently on each side of the
breakpoint.

Desktop

Phone

Use a media query to add a breakpoint at 768px:

Example

When the screen (browser window) gets smaller than 768px, each column should have a width of 100%:

/* For desktop: */.col-1 {width: 8.33%;}.col-2 {width: 16.66%;}.col-3 {width: 25%;}
.col-4 {width: 33.33%;}.col-5 {width: 41.66%;}.col-6 {width: 50%;}
.col-7 {width: 58.33%;}.col-8 {width: 66.66%;}.col-9 {width: 75%;}
.col-10 {width: 83.33%;}.col-11 {width: 91.66%;}.col-12 {width:
100%;}@media only screen and (max-width: 768px) { /* For mobile phones: */

{ width: 100%; }}

Ориентир на настольные ПК и max-width

Большая часть разработчиков до сих пор ориентируется только на пользователей ПК. Часто осознание ситуации приходит, когда становится ясно, сколько сил было потрачено впустую на компоненты для ПК, которые все реже востребованы из-за растущего числа мобильных пользователей. При анализе стилей подобных сайтов чаще всего встречается CSS media max width.

Если дизайн разрабатывался в первую очередь под настольные ПК, значит весь CSS должен быть насыщен объемным кодом для других ключевых точек (breakpoints). Если определенная ширина, заданная для ПК, является точкой отсчета, и мы не станем изменять и переписывать наш CSS, то вполне логично будет поменять в базовых стилях значения ширины окна просмотра на те, которые мы собираемся применять к экранам меньшего размера.

Вот пример, которым я часто пользуюсь (предполагая, что .related принимает форму боковой панели):

.content {
  width: 60%;
}

.related {
  width: 40%;
}

@media screen and (max-width: 37.4em) {
  .content,
  .related {
    width: 100%;
  }
}

Такой подход при использовании со множеством компонентов может существенно увеличить объем CSS завершенного проекта. Но так как блочные элементы по умолчанию занимают 100% ширины родительского элемента, то разумнее было бы прописать все следующим образом:

@media screen and (min-width: 37.5em) {
  .content {
    width: 60%;
  }

  .related {
    width: 40%;
  }
}

Здесь мы используем стандартное положение блочных элементов, и перекрываем их, когда это состояние требуется изменить. Чтобы лучше понять суть всего сказанного, нужно изучить рабочий код таких сайтов.

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Colors
RGB
HEX
HSL

CSS Backgrounds
Background Color
Background Image
Background Repeat
Background Attachment
Background Shorthand

CSS Borders
Borders
Border Width
Border Color
Border Sides
Border Shorthand
Rounded Borders

CSS Margins
Margins
Margin Collapse

CSS PaddingCSS Height/WidthCSS Box ModelCSS Outline
Outline
Outline Width
Outline Color
Outline Shorthand
Outline Offset

CSS Text
Text Color
Text Alignment
Text Decoration
Text Transformation
Text Spacing
Text Shadow

CSS Fonts
Font Family
Font Web Safe
Font Fallbacks
Font Style
Font Size
Font Google
Font Pairings
Font Shorthand

CSS IconsCSS LinksCSS ListsCSS Tables
Table Borders
Table Size
Table Alignment
Table Style
Table Responsive

CSS DisplayCSS Max-widthCSS PositionCSS OverflowCSS Float
Float
Clear
Float Examples

CSS Inline-blockCSS AlignCSS CombinatorsCSS Pseudo-classCSS Pseudo-elementCSS OpacityCSS Navigation Bar
Navbar
Vertical Navbar
Horizontal Navbar

CSS DropdownsCSS Image GalleryCSS Image SpritesCSS Attr SelectorsCSS FormsCSS CountersCSS Website LayoutCSS UnitsCSS SpecificityCSS !important

Definition and Usage

The rule is used in media queries to apply different styles for different media types/devices.

Media queries can be used to check many things, such as:

width and height of the viewport
width and height of the device
orientation (is the tablet/phone in landscape or portrait mode?)
resolution

Using media queries are a popular technique for delivering a tailored style
sheet (responsive web design) to desktops, laptops, tablets, and mobile phones.

You can also use media queries to specify that certain styles are only for printed documents or for screen readers (mediatype: print, screen, or speech).

In addition to media types, there are also media features. Media features
provide more specific details to media queries, by allowing to test for a
specific feature of the user agent or display device. For example, you
can apply styles to only those screens that are greater, or smaller, than a
certain width.

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Linear Gradients
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Shadow Effects
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CSS Flexbox
CSS Flex Container
CSS Flex Items
CSS Flex Responsive

CSS Properties

align-contentalign-itemsalign-selfallanimationanimation-delayanimation-directionanimation-durationanimation-fill-modeanimation-iteration-countanimation-nameanimation-play-stateanimation-timing-functionbackface-visibilitybackgroundbackground-attachmentbackground-blend-modebackground-clipbackground-colorbackground-imagebackground-originbackground-positionbackground-repeatbackground-sizeborderborder-bottomborder-bottom-colorborder-bottom-left-radiusborder-bottom-right-radiusborder-bottom-styleborder-bottom-widthborder-collapseborder-colorborder-imageborder-image-outsetborder-image-repeatborder-image-sliceborder-image-sourceborder-image-widthborder-leftborder-left-colorborder-left-styleborder-left-widthborder-radiusborder-rightborder-right-colorborder-right-styleborder-right-widthborder-spacingborder-styleborder-topborder-top-colorborder-top-left-radiusborder-top-right-radiusborder-top-styleborder-top-widthborder-widthbottombox-decoration-breakbox-shadowbox-sizingbreak-afterbreak-beforebreak-insidecaption-sidecaret-color@charsetclearclipclip-pathcolorcolumn-countcolumn-fillcolumn-gapcolumn-rulecolumn-rule-colorcolumn-rule-stylecolumn-rule-widthcolumn-spancolumn-widthcolumnscontentcounter-incrementcounter-resetcursordirectiondisplayempty-cellsfilterflexflex-basisflex-directionflex-flowflex-growflex-shrinkflex-wrapfloatfont@font-facefont-familyfont-feature-settingsfont-kerningfont-sizefont-size-adjustfont-stretchfont-stylefont-variantfont-variant-capsfont-weightgapgridgrid-areagrid-auto-columnsgrid-auto-flowgrid-auto-rowsgrid-columngrid-column-endgrid-column-gapgrid-column-startgrid-gapgrid-rowgrid-row-endgrid-row-gapgrid-row-startgrid-templategrid-template-areasgrid-template-columnsgrid-template-rowshanging-punctuationheighthyphens@importisolationjustify-content@keyframesleftletter-spacingline-heightlist-stylelist-style-imagelist-style-positionlist-style-typemarginmargin-bottommargin-leftmargin-rightmargin-topmax-heightmax-width@mediamin-heightmin-widthmix-blend-modeobject-fitobject-positionopacityorderoutlineoutline-coloroutline-offsetoutline-styleoutline-widthoverflowoverflow-xoverflow-ypaddingpadding-bottompadding-leftpadding-rightpadding-toppage-break-afterpage-break-beforepage-break-insideperspectiveperspective-originpointer-eventspositionquotesresizerightrow-gapscroll-behaviortab-sizetable-layouttext-aligntext-align-lasttext-decorationtext-decoration-colortext-decoration-linetext-decoration-styletext-indenttext-justifytext-overflowtext-shadowtext-transformtoptransformtransform-origintransform-styletransitiontransition-delaytransition-durationtransition-propertytransition-timing-functionunicode-bidiuser-selectvertical-alignvisibilitywhite-spacewidthword-breakword-spacingword-wrapwriting-modez-index

Media Queries For Columns

A common use of media queries, is to create a flexible layout. In this example, we create a layout that varies between four, two and full-width columns, depending on different screen sizes:

Large screens:

Medium screens:

Small screens:

Example

/* Create four equal columns that floats next to each other */.column {
float: left; width: 25%;}/* On screens that are 992px
wide or less, go from
four columns to two columns */@media screen and (max-width: 992px) {
.column { width: 50%; }}/* On screens that are
600px wide or less, make
the columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) { .column { width:
100%; }}

Tip: A more modern way of creating column layouts, is to use CSS Flexbox (see example below).
However, it is not supported in Internet Explorer 10 and earlier versions. If you require IE6-10 support, use floats (as shown above).

To learn more about the Flexible Box Layout Module, read our CSS Flexbox chapter.

To learn more about Responsive Web Design, read our Responsive Web Design Tutorial.

Example

/* Container for flexboxes */.row { display: flex;
flex-wrap: wrap;}/* Create four equal columns */.column { flex: 25%;
padding: 20px;}/* On screens that are 992px wide or less, go from
four columns to two columns */@media screen and (max-width: 992px) {
.column { flex: 50%; }}/* On screens that are 600px wide or less, make
the columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) { .row {
flex-direction: column; }}

Media Queries Simple Examples

One way to use media queries is to have an alternate CSS section right inside your style sheet.

The following example changes the background-color to lightgreen if the
viewport is 480 pixels wide or wider (if the viewport is less than
480 pixels, the background-color will be pink):

Example

@media screen and (min-width: 480px) { body {
background-color: lightgreen; }}

The following example shows a menu that will float to the left of the page if
the viewport is 480 pixels wide or wider (if the viewport is less than
480 pixels, the menu will be on top of the content):

Example

@media screen and (min-width: 480px) { #leftsidebar
{width: 200px; float: left;} #main
{margin-left: 216px;}}

CSS @media Reference

For a full overview of all the media types and features/expressions, please look at the
@media rule in our CSS reference.

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CSS Advanced

CSS Rounded CornersCSS Border ImagesCSS BackgroundsCSS ColorsCSS Color KeywordsCSS Gradients
Linear Gradients
Radial Gradients

CSS Shadows
Shadow Effects
Box Shadow

CSS Box SizingCSS Media QueriesCSS MQ ExamplesCSS Flexbox
CSS Flexbox
CSS Flex Container
CSS Flex Items
CSS Flex Responsive

Media Features

Value	Description
any-hover	Does any available input mechanism allow the user to hover over elements? (added in Media Queries Level 4)
any-pointer	Is any available input mechanism a pointing device, and if so, how accurate is it? (added in Media Queries Level 4)
aspect-ratio	The ratio between the width and the height of the viewport
color	The number of bits per color component for the output device
color-gamut	The approximate range of colors that are supported by the user agent and output device (added in Media Queries Level 4)
color-index	The number of colors the device can display
grid	Whether the device is a grid or bitmap
height	The viewport height
hover	Does the primary input mechanism allow the user to hover over elements? (added in Media Queries Level 4)
inverted-colors	Is the browser or underlying OS inverting colors? (added in Media Queries Level 4)
light-level	Current ambient light level (added in Media Queries Level 4)
max-aspect-ratio	The maximum ratio between the width and the height of the display area
max-color	The maximum number of bits per color component for the output device
max-color-index	The maximum number of colors the device can display
max-height	The maximum height of the display area, such as a browser window
max-monochrome	The maximum number of bits per «color» on a monochrome (greyscale) device
max-resolution	The maximum resolution of the device, using dpi or dpcm
max-width	The maximum width of the display area, such as a browser window
min-aspect-ratio	The minimum ratio between the width and the height of the display area
min-color	The minimum number of bits per color component for the output device
min-color-index	The minimum number of colors the device can display
min-height	The minimum height of the display area, such as a browser window
min-monochrome	The minimum number of bits per «color» on a monochrome (greyscale) device
min-resolution	The minimum resolution of the device, using dpi or dpcm
min-width	The minimum width of the display area, such as a browser window
monochrome	The number of bits per «color» on a monochrome (greyscale) device
orientation	The orientation of the viewport (landscape or portrait mode)
overflow-block	How does the output device handle content that overflows the viewport along the block axis (added in Media Queries Level 4)
overflow-inline	Can content that overflows the viewport along the inline axis be scrolled (added in Media Queries Level 4)
pointer	Is the primary input mechanism a pointing device, and if so, how accurate is it? (added in Media Queries Level 4)
resolution	The resolution of the output device, using dpi or dpcm
scan	The scanning process of the output device
scripting	Is scripting (e.g. JavaScript) available? (added in Media Queries Level 4)
update	How quickly can the output device modify the appearance of the content (added in Media Queries Level 4)
width	The viewport width

Always Design for Mobile First

Mobile First means designing for mobile before designing for desktop or any
other device (This will make the page display faster on smaller devices).

This means that we must make some changes in our CSS.

Instead of changing styles when the width gets smaller than
768px, we should change the design when the width gets larger than
768px. This will make our design Mobile First:

Example

/* For mobile phones: */ { width: 100%;}@media only screen and (min-width:
768px) { /* For desktop: */ .col-1 {width: 8.33%;} .col-2 {width: 16.66%;} .col-3 {width: 25%;} .col-4 {width: 33.33%;}
.col-5 {width: 41.66%;} .col-6 {width: 50%;} .col-7 {width: 58.33%;}
.col-8 {width: 66.66%;} .col-9 {width: 75%;} .col-10 {width: 83.33%;} .col-11 {width: 91.66%;}
.col-12 {width: 100%;}}

CSS Properties

CSS Syntax

@media not|only mediatype and (mediafeature and|or|not
mediafeature) { CSS-Code;}

meaning of the not, only and and keywords:

not: The not keyword inverts the meaning of an entire media
query.

only: The only keyword prevents older browsers that do not support media queries with media features from applying the specified styles.
It has no effect on modern browsers.

and: The and keyword combines a media feature with a media
type or other media features.

They are all optional. However, if you use not or
only, you must also specify a media type.

You can also have different stylesheets for different media, like
this:

More Examples

Example

Hide an element when the browser’s width is 600px wide or less:

@media screen and (max-width: 600px) { div.example { display:
none;
}}

Example

Use mediaqueries to set the background-color to lavender if the viewport is
800 pixels wide or wider, to lightgreen if the viewport is between 400 and 799 pixels wide.
If the viewport is smaller than 400 pixels, the background-color is lightblue:

body {  background-color: lightblue;}@media screen and (min-width:
400px) { body {
background-color: lightgreen;  }}@media
screen and (min-width: 800px) { body {
background-color: lavender; }}

Example

Create a responsive navigation menu (displayed horizontally on large screens and vertically on small screens):

@media screen and (max-width: 600px) { .topnav a {
float: none; width: 100%;
}}

Example

Use media queries to create a responsive column layout:

/* On screens that are 992px wide or less, go from four columns to two
columns */@media screen and (max-width: 992px) { .column {
width: 50%;  }}/* On screens that are 600px wide or less, make the columns stack
on top of each other instead of next to each other */@media screen and (max-width:
600px) {  .column {    width: 100%;
  }}

Example

Use media queries to create a responsive website:

Example

Media queries can also be used to change layout of a page depending on the
orientation of the browser. You can have a set of CSS properties that will only
apply when the browser window is wider than its height, a so called «Landscape»
orientation.

Use a lightblue background color if the orientation is in landscape mode:

@media only screen and (orientation:
landscape) {  body {

background-color: lightblue;  }}

Example

Use mediaqueries to set the text color to green when the document is
displayed on the screen, and to black when it is printed:

@media screen { body {
color: green;   }}@media print {  body {    color: black;
  }}

Example

Comma separated list: add an additional media query to an already existing one, using a comma (this will behave like an OR operator):

/* When the width is between 600px and 900px OR above 1100px — change the
appearance of <div> */@media screen and (max-width: 900px) and
(min-width: 600px), (min-width: 1100px) { div.example {
font-size: 50px;    padding: 50px;
border: 8px solid black;    background: yellow;
}}

Typical Device Breakpoints

There are tons of screens and devices with different heights and widths, so it is hard to create an exact breakpoint for each device. To keep things simple you could target
five groups:

Example

/*
Extra small devices (phones, 600px and down) */@media only screen and (max-width: 600px)
{…} /* Small devices (portrait tablets and large phones, 600px and up)
*/@media only screen and (min-width: 600px) {…} /* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {…} /* Large devices (laptops/desktops, 992px and up)
*/
@media only screen and (min-width: 992px) {…} /* Extra large devices (large
laptops and desktops,
1200px and up) */@media only screen and (min-width: 1200px) {…}

CSS Media Queries — More Examples

Let us look at some more examples of using media queries.

Media queries are a popular technique for delivering a tailored style sheet to different devices. To demonstrate a simple example, we can change the background color for different devices:

Example

/* Set the background color of body to tan */body {
background-color: tan;}/* On
screens that are 992px or less, set the background color to blue */@media
screen and (max-width: 992px) { body {
background-color: blue; }}/* On screens that are 600px or less,
set the
background color to olive */@media screen and (max-width: 600px) {
body { background-color: olive; }}

Do you wonder why we use exactly 992px and 600px? They are what we call «typical breakpoints» for devices. You can read more about typical breakpoints in our Responsive Web Design Tutorial.