<style type="text/css">
.box{
width: 500px;
}
.container{
width: 100%;
padding-bottom: 50%;
position: relative;
}
.content{
width: 100%;
height: 100%;
position: absolute;
background-color: red;
}
</style>
</head>
<body>
<div class="box">
<div class="container">
<div class="content">122aaaaa22</div>
</div>
</div>
</body>
image.png
image.png
