main {
            max-width: 620px;
            width: 100%;
            margin:0 auto;
        }
        .app{
            width: 100%;
          
            height: calc(96% - 70px);
        }
        #player{
            object-fit: cover; 
            object-position: center center;
        }
        #buttons {
            height: 60px;
            text-align:center;
            padding-top:10px;
            background:#000;
        }
        #switch,
        #weixin,
        #next {
            background: #FFF;
            background: linear-gradient(to bottom, #FF2,#FB0);
            color: #AF2E08;
            font-size: 16px;
            font-weight: bold;
            height: 40px;
            padding: 0px 20px;
            margin: 0px 5px;
            border-radius: 20px;
        } 
        .notice-board {
            position: fixed;
            z-index: 9998;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: #141516;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .board-title {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 0;
            padding-top: 20%;
        }
        .board-title>h3 {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);
            color: #fff;
            font-size: 1.5rem;
        }
        .board-content{
            font-size: 1.2rem;
            margin: 10px;
            overflow: auto;
            height: 30%;
            margin-top: 25%;
            padding-top: 100px;
        }
        .notice-board .board {
            position: relative;
            z-index: 9999;
            width: calc(100% - 60px);
            margin: 0 auto;
            background-color: #fff;
            border-radius: 15px;
            background-position: top;
            background-repeat: no-repeat;
            background-size: contain;
            background-image: url(http://www.gsoso.com/template/news/m.hldty.cn/static/images/2.jpg);
        }
        .notice-board .board-btn-group {
            display: flex;
            justify-content: center;
            padding: 20px 10px;
        }
        .board-btn {
            text-align: center;
            display: block;
            padding: 10px 0;
            border-radius: 6px;
            font-size: 1.2rem;
            width: calc(50% - 5px);
        }