<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CSS实现三角形</title>
<style>
#tr1{
width:0;
height:0;
border-top: 50px solid skyblue;
border-right:50px solid transparent;
border-left:50px solid transparent;
}
#tr2{
border-style:solid;
border-color:transparent;
border-width:50px 0 50px 50px;
border-left-color:skyblue;
}
#tr3{
width:0;
height:0;
border-left:69px solid transparent;
border-right:69px solid transparent;
border-bottom:120px solid skyblue;
}
</style>
</head>
<body>
<div id ="tr1"></div>
<div id ="tr2"></div>
<div id ="tr3"></div>
</body>
</html>
