html,body{
    width: 100%;
    height: 100%;
}
#mycontent{
    width: 100%;
    min-height: calc(100% - 305px);
    min-height: -ms-calc(100% - 305px);
    min-min-height: -moz-calc(100% - 305px);
	min-height: -webkit-calc(100% - 305px);
	min-height: -o-calc(100% - 305px);
    overflow: hidden;
    background: #f7f7f7;
}
#mycontent>div{
    width: 1220px;
    min-height: 320px;
    overflow: hidden;
    margin: 50px auto;
}
#menu{
    float: left;
    box-shadow: 0 5px 7px 0 rgba(6,0,1,0.2);
    margin-left: 10px;
}
#menu>li:first-child{
    width: 200px;
    height: 44px;
    background: #f44940;
    overflow: hidden;
}
#menu>li:first-child>span{
    display: block;
    width: 160px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    font-size: 24px;
    color: #fff;
    margin: 10px 20px;
    position: relative;
}
#menu>li:first-child>span>img{
    position: absolute;
    right: 0;
    bottom: 0;
}
#menu>li:first-child~li{
    width: 200px;
    height: 58px;
    cursor: pointer;
    background: #fff;
}
#menu>li:first-child~li>span{
    display: block;
    width: 160px;
    height: 57px;
    margin: 0 20px;
    line-height: 57px;
    text-align: center;
    font-size: 18px;
    border-bottom: 1px solid #f7f7f7;
    color: #333;
}
#content{
    width: 980px; 
    float: left;
    margin-left: 20px;
}
@media screen and (max-width:1366px){
    #mycontent{
        min-height: calc(100% - 275px);
        min-height: -ms-calc(100% - 275px);
        min-min-height: -moz-calc(100% - 275px);
        min-height: -webkit-calc(100% - 275px);
        min-height: -o-calc(100% - 275px);
    }
    #mycontent>div{
        width: 980px;
        min-height: 260px;
        margin: 30px auto;
    }
    #menu>li:first-child{
        width: 160px;
        height: 34px;
    }
    #menu>li:first-child>span{
        width: 130px;
        margin: 5px auto;
        font-size: 18px;
    }
    #menu>li:first-child~li{
        width: 160px;
        height: 46px;
    }
    #menu>li:first-child~li>span{
        width: 130px;
        height: 45px;
        line-height: 45px;
        font-size: 14px;
        margin: 0 15px;
    }
    #content{
        width: 785px;
        margin-left: 15px;
    }
}