css悬浮提示框

效果图：
code：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title> 文字渐变色</title>
    <style>
        span {
            background-image: linear-gradient(to right, red, blue);
            -webkit-background-clip: text;
            color: transparent;
        }
        h1{
            position: relative;
            color: yellow;
        }
        h1:before{
            content: attr(text);
            position: absolute;
            z-index: 10;
            color:pink;
            -webkit-mask:linear-gradient(to left, red, transparent );
        }

        .content{
            text-align: center;
            height: 50px;
            line-height: 50px;
            width: 180px;
            margin: 100px auto;
            padding: 5px;
            background-color: rgb(196,0,0);
            color: white;
            font-size: 18px;
            position: relative;
        }
        .content:hover{
            cursor: pointer;
        }
        .content:hover:before{
            content: attr(data-content); /*动态获取数据*/
            position: absolute;
            left: 100%;
            width:200px;
            height: 50px;
            font-size: 18px;
            line-height: 50px;
            background-color: rgb(0,196,0);
            margin-left: 12px;
        }
        .content:hover:after{ /*实现小三角*/
            content: "";
            position: absolute;
            left: 100%;
            top: 50%;
            margin: -10px 0 0 -8px;

            width: 0;
            height: 0;
            border:10px solid  transparent;
            border-right-color: rgb(0,196,0)
        }

        /* 3角型原理 详细可参考https://www.cnblogs.com/shazhou-blog/p/5168740.html */
        #span1 {
            width:0;
            height:0;
            overflow:hidden;
            border:7px solid transparent;
            border-top-color:#2DCB70;
            /* top就是倒三角，bottom就是上三角，left,right类似  */
        }
    </style>
</head>
<body>
    https://blog.csdn.net/fe_dev/article/details/78450844
    <br>
    <span>前端简单说</span>

    <h1 text="前端简单说">前端简单说</h1>

    <div data-content="我是一个悬浮提示框" class="content">鼠标滑过我 我是css</div>

    <span id="span1"></span>
</body>
</html>