版权声明：谁没个菜的时候！ https://blog.csdn.net/qq_32584661/article/details/81943221
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
body{margin: 0;}
.main{
border:1px solid #aaa;position: relative;overflow: hidden;
width:100%;}
.main:before{
content:"";
display: table;
}
.main:after{
content:"";
display: table;
clear: both;
}
.container{width:500px;margin: 80px auto;
background: rgba(255,255,255,0.6);
border: 1px solid #aaa;
border-radius:6px;}
.bg_video{position: absolute;left:0;top:-300px;z-index:-1;}
</style>
</head>
<body>
<h3>使用视频做背景的DIV</h3>
<div class="main">
<div class="container">
<h4>注册新用户</h4>
<h4>注册新用户</h4>
<h4>注册新用户</h4>
<h4>注册新用户</h4>
</div>
<video class="bg_video" src="video.mp4" width="100%" autoplay loop muted></video>
</div>
<script>
</script>
</body>
</html>
