<div id="wrap">
  <div id="header"></div>
  <div id="nav"></div>
  <div id="aside"></div>
  <div id="section"></div>
  <div id="footer"></div>
</div>

* {
    padding: 0;
    margin: 0;
}
body {
    background-color: #FFF3E0;
}
#wrap{
    width: 1200px;
    margin: 0 auto;
}
#header{
    width: 100%;
    height: 100px;
    background-color: #FFE0B2;
}
#nav{
    width: 100%;
    height: 100px;
    background-color: #FFCC80;
}
#aside {
    width: 30%;
    height: 780px;
    background-color: #FFB74D;
    float: left;
}
#section{
    width: 70%;
    height: 780px;
    background-color: #FFA726;
    float: left;
}
#footer{
    width: 100%;
    height: 100px;
    background-color: #FF9800;
    clear: both;
}
@media (max-width: 1220px){
    #wrap {
        width: 96%;
    }
}
@media (max-width: 768px){
    #wrap {
        width: 100%;
    }
}
@media (max-width: 480px){
    #aside {
        width: 100%;
        height: 300px;
    }
    #section{
        width: 100%;
        height: 480px;
    }
}