Effect (the source code network disk address is at the end)
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source code
index.html
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="./style.css">
</head>
<body>
<!-- partial:index.partial.html -->
<div>
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
</body>
</html>
css
body{
margin:0;
padding:0;
background:rgba(0,0,0,.9);
}
ul{
position:absolute;
top:50%;
left:50%