body{
    background: lightblue;
   
}
li{
    list-style: none;
    text-align: center;
}
.content{
    margin: 100px auto;
     width: 400px;
     height: 300px;
     /* background: red; */
     /* display: inline-block; */

}
.top{
    width: 100%;
   line-height: 50px;
    display: inline-block;
    border:1px solid green;
    background: orange;
}
.top li{
    width: 25%;
    float: left;
    height: 100%;
  
}
.top .active{
    background: green;
    color: white;
}
.box{
   height: 250px;
    width: 400px;
    margin-top: -6px;
    border:1px solid green;
    background: green;
    color: white;
}
.box li{
     margin-top:110px;
}