<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>分类弹窗</title>
<style>
.container{
position: relative;
width: 280px;
height: 400px;
padding: 5px;
background-color: pink;
box-sizing: border-box;
}
.menu{
height: 100%;
width: 100%;
background-color: cadetblue;
}
.layer{
display: none;
position: absolute;
top: 0;
left: 280px;
width: 520px;
height: 400px;
background-color: coral;
}
// 放在最后，以便覆盖前面的样式！！
.container:hover .layer{
display: block;
}
</style>
</head>
<body>
<div class="container">
<div class="menu"></div>
<div class="layer"></div>
</div>
</body>
</html>
