HTML+CSS实现鼠标点上去动画效果

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>瀑布流</title>
    <link rel="stylesheet" href="css/style.css">
    <script src="js/jquery-3.4.1.js" type="text/javascript"></script>
</head>

<body>

    <section id="titleBar">
        <h2>瀑布流</h2>
    </section>
    <div id="wrap">
        <!-- wrap内快速生成里面div结构的快捷方式 -->
        <!-- (div.box>div.info>((div.pic>img[src="img/$.jpg"])+(div.title>a[href=#]{This is a title})))*10 -->
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/1.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/2.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/3.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/4.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/5.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/6.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/7.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/8.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/9.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
        <div class="box">
            <div class="info">
                <div class="pic"><img src="img/10.jpg" alt=""></div>
                <div class="title"><a href="#">This is a title.</a></div>
            </div>
        </div>
    </div>

</body>

</html>

css文件如下

body {
    margin: 0;
    padding: 0;
}

body {
    background: #ddd url(../img/bg.jpg) repeat;
}

img {
    border: none;
}

a {
    text-decoration: none;
    color: #444;
}

@-webkit-keyframes shade {
    from {
        opacity: 1;
    }
    15% {
        opacity: 0.4;
    }
    to {
        opacity: 1;
    }
}

@-moz-keyframes shade {
    from {
        opacity: 1;
    }
    15% {
        opacity: 0.4;
    }
    to {
        opacity: 1;
    }
}

@-o-keyframes shade {
    from {
        opacity: 1;
    }
    15% {
        opacity: 0.4;
    }
    to {
        opacity: 1;
    }
}

@-ms-keyframes shade {
    from {
        opacity: 1;
    }
    15% {
        opacity: 0.4;
    }
    to {
        opacity: 1;
    }
}

@keyframes shade {
    from {
        opacity: 1;
    }
    15% {
        opacity: 0.4;
    }
    to {
        opacity: 1;
    }
}

#titleBar {
    width: 600px;
    margin: 20px auto;
    text-align: center;
}

#wrap {
    width: auto;
    height: auto;
    margin: 0 auto;
    position: relative;
}

#wrap .box {
    width: 280px;
    height: auto;
    padding: 10px;
    border: none;
    float: left;
}

#wrap .box .info {
    width: 280px;
    height: auto;
    border-radius: 8px;
    background: #fff;
}

#wrap .box .info .pic {
    width: 260px;
    height: auto;
    margin: 0 auto;
    padding-top: 10px;
}

#wrap .box .info .pic:hover {
    -webkit-animation: shade 3s ease-in-out 1;
    -moz-animation: shade 3s ease-in-out 1;
    -o-animation: shade 3s ease-in-out 1;
    -ms-animation: shade 3s ease-in-out 1;
    animation: shade 3s ease-in-out 1;
}

#wrap .box .info .title:hover {
    -webkit-animation: shade 3s ease-in-out 1;
    -moz-animation: shade 3s ease-in-out 1;
    -o-animation: shade 3s ease-in-out 1;
    -ms-animation: shade 3s ease-in-out 1;
    animation: shade 3s ease-in-out 1;
}

#wrap .box .info img {
    width: 260px;
    border-radius: 3px;
}

#wrap .box .info .title {
    width: 260px;
    height: 40px;
    margin: 0 auto;
    line-height: 40px;
    text-align: center;
    color: #666;
    font-size: 18px;
    font-weight: bold;
    overflow: hidden;
}

效果图如下

望各位大虾不吝赐教！

谢谢

HTML+CSS实现鼠标点上去动画效果

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