header {
background-color:blue;
color:white;
text-align:center;
padding:5px;
}
nav {
background-color:yellow;
padding:7px;
}
section {
padding: 15px;
margin: 10px 10px 10px 10px;
width: 300px;
float: left;
}
aside{
background-color:blue;
color: yellow;
padding:15px;
margin:10px 0px 10px 350px;
}
footer {
background-color:red;
color:white;
clear:both;
text-align:center;
padding:5px;
}
#allcontent{
width: 840px;
margin-left:auto;
margin-right:auto;
}