【CSS】实现三角形

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思路:

1.写一个div
2.将正方形的border加粗
3.隐藏其余三边 上代码

<!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>
        .sanjiaoxing{
            height:0px;
            width: 0px;
            border-top:50px solid red ;
            border-right:50px solid transparent ;
            border-bottom:50px solid transparent ;
            border-left:50px solid transparent ;
        }
    </style>

</head>
<body>
    <div class="sanjiaoxing"></div>
</body>
</html>