hover时背景颜色从内向外辐射改变css，代码如下。

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<!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>
        .box {
            height: 200px;
            width: 200px;
            position: relative;
            overflow: hidden;
            margin: 200px auto;
            border-radius: 20px;
        }

        .box:before {
            content: "";
            position: absolute;
            border-radius: 20px;
            z-index: -10;
            width: 200px;
            height: 200px;
            left: 50%;
            top: 50%;
            margin-left: -100px;
            margin-top: -100px;
            opacity: 0;
            -webkit-transition: .5s cubic-bezier(.3, 0, 0, 1.3);
            -moz-transition: .5s cubic-bezier(.3, 0, 0, 1.3);
            -ms-transition: .5s cubic-bezier(.3, 0, 0, 1.3);
            -o-transition: .5s cubic-bezier(.3, 0, 0, 1.3);
            transition: .5s cubic-bezier(.3, 0, 0, 1.3);
            -webkit-transform: scale(0, 0);
            -moz-transform: scale(0, 0);
            -ms-transform: scale(0, 0);
            -o-transform: scale(0, 0);
            transform: scale(0, 0);
            background-color: #49B1F5;
        }

        .box:hover:before {
            opacity: 0.9;
            -webkit-transform: scale(1, 1);
            -moz-transform: scale(1, 1);
            -ms-transform: scale(1, 1);
            -o-transform: scale(1, 1);
            transform: scale(1, 1);
        }

        .box:hover img {
            transform: rotate(360deg);
        }

        .box img {
            width: 100px;
            height: 100px;
            display: block;
            margin: 10px auto;
            transition: all 1.0s;
        }

        .box .phbtext {
            text-align: center;
        }
    </style>
</head>

<body>
    <div class="box">
        <img src="https://blog-static.cnblogs.com/files/aqingya/aqingya.ico">
        <div class="phbtext">阿清的小站</div>
        <div class="phbtext">一个记录学习的地方</div>
    </div>
</body>

</html>