<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#sj{
width: 0;
border-top: 20px solid #fde;
border-bottom: 20px solid #ffb;
border-left: 20px solid #fba;
border-right: 20px solid #bac;
}
.box{
width: 200px;
height: 200px;
border-top: 5px solid #def;
border-left: 5px solid #bac;
}
</style>
</head>
<body>
<div id="sj"> </div>
<div class="box"></div>
</body>
</html>
在三角形的透明上可以采用三种解决方案,
1.将背景颜色设置成和所对应的背景颜色相同
2.强css中的背景颜色采用rgba()来设置
3.利用transparent属性值