<style>
        *{
            margin: 0;
            padding: 0;
        }
        .box{
            width: 300px;
            height: 224px;
            overflow: hidden;
            margin: 40px auto;
            position: relative;
        }
        .box img{
            width: 280px;
            height: 224px;
        }
        .box p{
            position: absolute;
            top: 224px;
            width: 270px;
            height: 60px;
            padding-left: 10px;
            line-height: 60px;
            color: white;
            background-color: rgba(0, 0, 0, .4);
            transition: top 1s ease-in-out 0s;
        }
        .box:hover p{
            top:164px;
        }
    </style>

    <div class="box">
        <img src="images/duck.png" alt="">
        <p>这是一只小黄鸭</p>
    </div>