<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
body{
background: darkmagenta;
}
#bg {
position: relative;
width: 1000px;
height: 500px;
margin: 40px auto;
background: #000;
cursor: pointer;
border-radius:15px;
opacity: 0.9;
box-shadow:0 -10px 10px 0 red,10px 0 10px 0 yellow,0 10px 10px 0 green,-10px 0 10px 0 blue;
-webkit-box-shadow:0 -10px 10px 0 red,10px 0 10px 0 yellow,0 10px 10px 0 green,-10px 0 10px 0 blue;
}
.boll {
position: absolute;
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