css media query viewport height code example
Example 1: media query
@media only screen and (max-width: 600px) {
body {
background-color: lightblue;
}
}
Example 2: media query in html style
span { background-image: url(particular_ad.png); }
@media (max-width: 300px) {
span { background-image: url(particular_ad_small.png); }
}