*{

    margin: 0;
    
    padding: 0;
    
    text-decoration: none;
    
    list-style: none;
    
    }  
    
    .Ymain{
    
    width: 1456.8px;
    
    margin: auto;
    
    }
    
    .Yheader,.Ynav,.Ycontainer,.Yfooter{
    
    
    
    display: flex;
    width: 100%;
    
    
    box-sizing: border-box;
    
    }
    
    .Yheader{
    
    background-image: url(./img/111.png);
        background-size: 100%;
        width: 100%;
        height: 48rem;
    
    padding: 20px; 

    /* background-image:海报图片 */
    
    }
    
    
    .Ynav{
    
    background: rgb(242, 95, 95);
    font-size: 16px;
    font-family: 黑体;
    font-weight: bold;
    
    }
    
    .Ynav a{
    
        color: #f8f8f8;
    
        padding: 10px 150px;
        
        display: inline-block;
        text-decoration: none;
   
    
    }
    
    .Ynav a:hover{
    
    background: #f3b9b9;
    
    color: #000;
    
    }
    
    
    .Yfooter{
    
    padding: 10px;
    
    background:rgb(231, 151, 151);
    
    text-align: center;
    width: 1456.8px;
   
    
    
    }