Suppose, we want to apply the given CSS effect only one device with a maximum width of 400 px, then we can write it as;
Example 1

@media (max-width: 400px)
{
.a{ background-color:#FF0000; }
}
This Code will apply background color only on devices with width <= 400px. It will not work on display screens with >400px.
Example 2

@media (min-width: 400px)
{
.a{ background-color:#FF0000; }
}
This Code will apply background color on devices with width at least 400px. It means that this CSS will work on mobile phones, laptops and desktop screen etc.
<html>
<head>
<style>
@media (max-width: 1200px) {
.a{
background-color:#FF0000;
}}
</style>
</head>
<body>
<div class="a">
Hello, this is the div.
</div>
</body>
</html>
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Laptops
Non-Retina Screens, Retina Screens.
/* Non-Retina Screens */
@media screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* Retina Screens */
@media screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 2)
and (min-resolution: 192dpi) {
}
Windows Phones
Windows Phone, Portrait, and Landscape.
/* Windows Phone */
/* Portrait and Landscape */
@media screen
and (device-width: 480px)
and (device-height: 800px) {
}
/* Portrait */
@media screen
and (device-width: 480px)
and (device-height: 800px)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 480px)
and (device-height: 800px)
and (orientation: landscape) {
}
Galaxy
Galaxy S3, Portrait, and Landscape, Galaxy S6.
/* Galaxy S3 */
/* Portrait and Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 2) {
}
/* Portrait */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 2)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 2)
and (orientation: landscape) {
}
/* Galaxy S4, S5 and Note 3 */
/* Portrait and Landscape */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3) {
}
/* Portrait */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 320px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: landscape) {
}
/* Galaxy S6 */
/* Portrait and Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 4) {
}
/* Portrait */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 4)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 4)
and (orientation: landscape) {
}
HTC Phones
HTC One Portrait and Landscape.
/* HTC One */
/* Portrait and Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3) {
}
/* Portrait */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: landscape) {
}
iPhones
iPhone 4 and 4S, Portrait and Landscape, iPhone 5, 5S, 5C and 5SE, iPhone 6, 6S, 7 and 8.
/* iPhone 4 and 4S */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 320px)
and (max-device-width: 480px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Portrait */
@media only screen
and (min-device-width: 320px)
and (max-device-width: 480px)
and (-webkit-min-device-pixel-ratio: 2)
and (orientation: portrait) {
}
/* Landscape */
@media only screen
and (min-device-width: 320px)
and (max-device-width: 480px)
and (-webkit-min-device-pixel-ratio: 2)
and (orientation: landscape) {
}
/* iPhone 5, 5S, 5C and 5SE */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 320px)
and (max-device-width: 568px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Portrait */
@media only screen
and (min-device-width: 320px)
and (max-device-width: 568px)
and (-webkit-min-device-pixel-ratio: 2)
and (orientation: portrait) {
}
/* Landscape */
@media only screen
and (min-device-width: 320px)
and (max-device-width: 568px)
and (-webkit-min-device-pixel-ratio: 2)
and (orientation: landscape) {
}
/* iPhone 6, 6S, 7 and 8 */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 375px)
and (max-device-width: 667px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Portrait */
@media only screen
and (min-device-width: 375px)
and (max-device-width: 667px)
and (-webkit-min-device-pixel-ratio: 2)
and (orientation: portrait) {
}
/* Landscape */
@media only screen
and (min-device-width: 375px)
and (max-device-width: 667px)
and (-webkit-min-device-pixel-ratio: 2)
and (orientation: landscape) {
}
/* iPhone 6+, 7+ and 8+ */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 414px)
and (max-device-width: 736px)
and (-webkit-min-device-pixel-ratio: 3) {
}
/* Portrait */
@media only screen
and (min-device-width: 414px)
and (max-device-width: 736px)
and (-webkit-min-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* Landscape */
@media only screen
and (min-device-width: 414px)
and (max-device-width: 736px)
and (-webkit-min-device-pixel-ratio: 3)
and (orientation: landscape) {
}
/* ----------- iPhone X ----------- */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 375px)
and (max-device-width: 812px)
and (-webkit-min-device-pixel-ratio: 3) {
}
/* Portrait */
@media only screen
and (min-device-width: 375px)
and (max-device-width: 812px)
and (-webkit-min-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* Landscape */
@media only screen
and (min-device-width: 375px)
and (max-device-width: 812px)
and (-webkit-min-device-pixel-ratio: 3)
and (orientation: landscape) {
}
Google Pixel
Google Pixel Portrait and Landscape, Google Pixel XL.
/* ----------- Google Pixel ----------- */
/* Portrait and Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3) {
}
/* Portrait */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 3)
and (orientation: landscape) {
}
/* Google Pixel XL */
/* Portrait and Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 4) {
}
/* Portrait */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 4)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 360px)
and (device-height: 640px)
and (-webkit-device-pixel-ratio: 4)
and (orientation: landscape) {
}
iPads Tablets
iPad 1, 2, Mini and Air, Portrait and Landscape, iPad 3, 4 and Pro 9.7, iPad Pro 10.5.
/* iPad 1, 2, Mini and Air */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 768px)
and (max-device-width: 1024px)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* Portrait */
@media only screen
and (min-device-width: 768px)
and (max-device-width: 1024px)
and (orientation: portrait)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* Landscape */
@media only screen
and (min-device-width: 768px)
and (max-device-width: 1024px)
and (orientation: landscape)
and (-webkit-min-device-pixel-ratio: 1) {
}
/* iPad 3, 4 and Pro 9.7 */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 768px)
and (max-device-width: 1024px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Portrait */
@media only screen
and (min-device-width: 768px)
and (max-device-width: 1024px)
and (orientation: portrait)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Landscape */
@media only screen
and (min-device-width: 768px)
and (max-device-width: 1024px)
and (orientation: landscape)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* iPad Pro 10.5 */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 834px)
and (max-device-width: 1112px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Portrait */
/* Declare the same value for min- and max-width to avoid colliding with desktops */
/* Source: https://medium.com/connect-the-dots/css-media-queries-for-ipad-pro-8cad10e17106*/
@media only screen
and (min-device-width: 834px)
and (max-device-width: 834px)
and (orientation: portrait)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Landscape */
/* Declare the same value for min- and max-width to avoid colliding with desktops */
/* Source: https://medium.com/connect-the-dots/css-media-queries-for-ipad-pro-8cad10e17106*/
@media only screen
and (min-device-width: 1112px)
and (max-device-width: 1112px)
and (orientation: landscape)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* iPad Pro 12.9 */
/* Portrait and Landscape */
@media only screen
and (min-device-width: 1024px)
and (max-device-width: 1366px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Portrait */
/* Declare the same value for min- and max-width to avoid colliding with desktops */
/* Source: https://medium.com/connect-the-dots/css-media-queries-for-ipad-pro-8cad10e17106*/
@media only screen
and (min-device-width: 1024px)
and (max-device-width: 1024px)
and (orientation: portrait)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Landscape */
/* Declare the same value for min- and max-width to avoid colliding with desktops */
/* Source: https://medium.com/connect-the-dots/css-media-queries-for-ipad-pro-8cad10e17106*/
@media only screen
and (min-device-width: 1366px)
and (max-device-width: 1366px)
and (orientation: landscape)
and (-webkit-min-device-pixel-ratio: 2) {
}
Galaxy Tables
Galaxy Tab 2 Portrait and Landscape, Galaxy Tab S.
/* Galaxy Tab 2 */
/* Portrait and Landscape */
@media
(min-device-width: 800px)
and (max-device-width: 1280px) {
}
/* Portrait */
@media
(max-device-width: 800px)
and (orientation: portrait) {
}
/* Landscape */
@media
(max-device-width: 1280px)
and (orientation: landscape) {
}
/* Galaxy Tab S */
/* Portrait and Landscape */
@media
(min-device-width: 800px)
and (max-device-width: 1280px)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Portrait */
@media
(max-device-width: 800px)
and (orientation: portrait)
and (-webkit-min-device-pixel-ratio: 2) {
}
/* Landscape */
@media
(max-device-width: 1280px)
and (orientation: landscape)
and (-webkit-min-device-pixel-ratio: 2) {
}
Nexus Tablets
Nexus 7 Portrait and Landscape, Nexus 9.
/* Nexus 7 */
/* Portrait and Landscape */
@media screen
and (device-width: 601px)
and (device-height: 906px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332) {
}
/* Portrait */
@media screen
and (device-width: 601px)
and (device-height: 906px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 601px)
and (device-height: 906px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332)
and (orientation: landscape) {
}
/* Nexus 9 */
/* Portrait and Landscape */
@media screen
and (device-width: 1536px)
and (device-height: 2048px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332) {
}
/* Portrait */
@media screen
and (device-width: 1536px)
and (device-height: 2048px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332)
and (orientation: portrait) {
}
/* Landscape */
@media screen
and (device-width: 1536px)
and (device-height: 2048px)
and (-webkit-min-device-pixel-ratio: 1.331)
and (-webkit-max-device-pixel-ratio: 1.332)
and (orientation: landscape) {
}