<div class="div">
<div class ="d1"> 圖片上下滾動。
<img src="images/jianshe.png">
</div>
<div class="d1">
<img src="images/zhaoshang.png">
</div>
</div>

<style>
.div{
    height: 50px;
    width: 100px;
    border:1px solid red;
    overflow: hidden;
}
    .d1 img{
        width:50px;
        height:50px;
        position: relative;
        animation: myimg 5s infinite;
    }
    @keyframes myimg{
        0%{top: 0px;}
        50%{top: -50px;}
        100%{top: 0px;}
    }
</style>