<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>media-query</title>
</head>
<body>
<div class="block"></div>
<style>
.block{
margin: 0 auto;
width: 900px;
height: 200px;
background-color:#777;
}
@media screen and(max-width: 1000px){
.block{
width: 700px;
background-color: green;
}
}
</style>
</body>
</html>
Средний
Простой
