html {
            overflow-y: scroll;
            height: 100%;
        }
        
         :root {
            overflow-y: auto;
            overflow-x: hidden;
        }
        
         :root body {
            position: absolute;
        }
        
        body {
            height: 100%;
            width: 100vw;
            overflow: hidden;
        }
        
        .common-top {
            width: 100%;
            height: 100px;
            text-align: center;
            line-height:100px;
            background-color: rgb(0, 174, 255);
            position: fixed;
            z-index: 99999;
        }
        
        .cover {
            margin-top: 100px;
            width: 100%;
            height: 100%;
            position: fixed;
            z-index: 99997;
            background:rgba(0,0,0,0.5)
        }
        
        .articles {
            margin-left: 20%;
            width: 60%;
            background-color: white;
        }