用CSS做一个三角形

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style type="text/css">
            div{width: 0px;height: 0px;
            border-top-color: green;
            border-top-style: solid;
            border-top-width: 300px;
            border-right-color: blue;
            border-right-style: solid;
            border-right-width: 300px;
            border-left-color: red;
            border-left-style: solid;
            border-left-width: 300px;
            border-bottom-color: yellow;
            border-bottom-style: solid;
            border-bottom-width: 300px;
            }
        </style>
    </head>
    <body>
        <div >
            
        </div>
    </body>
</html>
原文地址:https://www.cnblogs.com/tilyougogannbare666/p/13365327.html