abcdefghijklmnopqrstuvwxyz.
.leftcolumn{
border:2px solid black;
float:left;
width:60%
background-color:#aaa;
margin-bottom:20px;
}
abcdefghijklmnopqrstuvwxyz.
abcdefghijklmnopqrstuvwxyz.
abcdefghijklmnopqrstuvwxyz.
.rightcolumn{
border:2px solid black;
float:right;
width:35%
background-color:#aaa;
margin-bottom:20px;
}
footer{
border:2px solid black;
background-color:#aaa;
}
.clr{
display:block;
clear:both;
}