老师帮忙看下这样做对不对，有没有冗余代码，哪里需要优化？

来源：2-8 过渡效果实战课（1）

weixin_慕码人7523200

2020-11-04 21:25:02

# 具体遇到的问题

# 报错信息的截图

# 相关课程内容截图

# 尝试过的解决思路和结果

# 粘贴全部相关代码，切记添加代码注释（请勿截图）

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 700px;
            height: 200px;
            margin: 100px auto;
        }

        .box .box1 {
            float: left;
            position: relative;
            width: 200px;
            height: 200px;
            overflow: hidden;
        }

        .box .box1+.box1 {
            margin-left: 50px;
        }

        .box .box1 img {
            width: 200px;
            height: 200px;
        }

        .box .box1 span:nth-of-type(1) {
            position: absolute;
            bottom: 0;
            width: 200px;
            height: 30px;
            background: #000;
            color: white;
            text-align: center;
            line-height: 30px;
            opacity: 0;
            transition: opacity 1s linear 0s;
        }

        .box .box1:hover span:nth-of-type(1) {
            opacity: 1;
        }

        .box .box1 span:nth-of-type(2) {
            position: absolute;
            top: -30px;
            width: 200px;
            height: 30px;
            background: #000;
            color: white;
            text-align: center;
            line-height: 30px;
            transition: top .5s linear 0s;
        }

        .box .box1:hover span:nth-of-type(2) {
            top: 0;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="box1">
            <span>我是底部淡入文字</span>
            <span>我是顶部hidden文字</span>
            <img src="../images/03-04.jpg" alt="">
        </div>
        <div class="box1">
            <span>我是底部淡入文字</span>
            <span>我是顶部hidden文字</span>
            <img src="../images/news_pic.png" alt="">
        </div>
        <div class="box1">
            <span>我是底部淡入文字</span>
            <span>我是顶部hidden文字</span>
            <img src="../images/cos.jpg" alt="">
        </div>
    </div>
</body>

</html>