body {
 font-family: 'Microsoft YaHei', sans-serif;
 margin:20px;
 background-color: #f4f4f4;
}

     .notice {
 width:90%;
 margin:0 auto;
 padding:20px;
 background-color: #fff;
 border-radius:5px;
 box-shadow:1px 15px 10px rgba(0,0,0,0.1);
 }
 
 h1{
 text-align: center;
 }
 
 p{
 text-align: center;
 
 }
 
 h4{
     text-align: center;
     
 }
 
 h5{
     text-align: center;
 color:gray;
 
 }
 .imgss{
 width: 100%;
 border-radius: 8px;
 }
 
 .videozz{
 width:100%;
 border-radius: 5px;
 }
 
  .footer {
 text-align: center; /* 页脚居中 */
 margin-top:65px; /* 设置上边距 */
 font-size:0.9em; /* 小号字体 */
 color: #666; /* 页脚颜色 */
 }

      .ch {
            width:80px;
            padding: 6px;
            background: #222222;
            border-radius: 45px;
            color: white;
            box-shadow:1px 15px 10px rgba(0,0,0,0.2);
            }