css gradient 

<!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>
</head>
<body>

    <style>
        .box{
            width:100%;
            height: 500px;
            background:blue;
        }
        .bg-gradient{
            background-image: linear-gradient(to right,rgba(0,0,0,.5),rgba(255,255,255,.5));
        }
    </style>

    <div class="box bg-gradient">
    </div>
</body>
</html>

 更多参考：CSS3中的 Background:linear-gradient()用法详解 - 简书 (jianshu.com)

posted @ 2022-02-14 22:40  lunawzh  阅读(21)  评论(0)  编辑  收藏  举报