#tab{
    width: 1120px;
    margin:0 auto;
}

    #tab-header ul li{  
        float: left;  
        width: 545px;  
        height: 80px;  
        line-height: 80px;  
        padding: 0 1px;  
        border-bottom: 1px solid #dddddd;  
        text-align:center;
        font-size: 40px;
        background: white;
    }  
    #tab-header ul li.selected{  
        background-color: yellow;  
        font-weight: bolder;  
        border-bottom: 0;  
        border-left: 1px solid #dddddd;  
        border-right: 1px solid #dddddd;  
        padding: 0;  
        color: orangered;  
        background: yellow;
      
    }  
      
    #tab-header ul li:hover{  
        color: orangered;  
        background: yellow;
    }  
      
    /*主要内容*/  
    #tab-content .dom{  
        display: none;  
    }