add media query in html code example
Example 1: media query
@media only screen and (max-width: 600px) {
.class {
// Your CSS
}
}
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); }
}