body {
text-align: center;
}

div {
margin: 1%;
}

#wrap {
display: block;
border: 5px black solid;
width:90%;
margin:0px auto;
}

#header {
border: 2px green solid;
}

#content {
width: 70%;
border: 2px red solid;
float: left;
}

#sidebar {
width: 20%;
border: 2px yellow solid;
float: right;
}

#footer {
border: 2px blue solid;
clear: both;
}