.qr-code {
        display: none;
        position: absolute;
        top: 0;
        right: 50px;
        width: 100px;
        height: 100px;
        background-color: white;
        border: 1px solid #ccc;
        padding: 0px;
        box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);}
    a:hover + .qr-code {
        display: block;}
.mainContent .articleList{padding: 30px;width: 1300px;}
.got{line-height: 45px;
    margin: 2em auto;
    background: #3333;
    height: 45px;}}
.serch{background:url(https://youth.aust.edu.cn/skin/images/ss.png) no-repeat 50% 50%;}