html + css制作小三角最终效果最终效果最终效果最终效果最终效果最终效果最终效果最终效果最终效果最终效果最终效果最

最终效果

<!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>Document</title>
    <style>
        body{
            background-color: gray;
        }
        div{
            width: 0px;
            height: 0px;
            /* border-top:10px solid red; */
            border-bottom: 10px solid rgb(242, 247, 247);
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>