利用边框设置三角形的方法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box0{
width: 0px;
height: 0px;
border:10px black solid;
border-color:transparent transparent blue transparent;
border-top:none;
margin-bottom: 10px;
}
.box1{
width: 0px;
height: 0px;
border:10px black solid;
border-color:red transparent transparent transparent;
border-bottom:none;
margin-bottom: 10px;
}
.box2{
width: 0px;
height: 0px;
border:10px black solid;
border-color:transparent green transparent transparent;
border-left:none;
margin-bottom: 10px;
}
.box3{
width: 0px;
height: 0px;
border:10px black solid;
border-color:transparent transparent transparent yellow;
border-right:none;
}
</style>
</head>
<body>
<div class="box0"></div>
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
</body>
</html>
效果
