@
darasion 试试下面的代码看看
<!DOCTYPE HTML>
<html lang="ru-RU">
<head>
<title></title>
<meta charset="UTF-8">
<style type="text/css">
background{
background:#fff;
}
div{
position:absolute;
top:10px;
left:10px;
height:0;
top:0;
}
#cover{
border:100px solid;
border-color:#fff transparent transparent transparent;
left:12px;
}
#line{
border:100px solid;
border-color:#000 transparent transparent transparent;
}
</style>
</head>
<body>
<div id="line"></div>
<div id="cover"></div>
</body>
</html>