#cabecera {
 height: 100px;
 background-color: #D6f9FE;
}

#menu {
 height: 50px;
 background-color: #B2D6FF; /* Medium blue */
}

#lateral {
 height: 300px;
 background-color: #F09A9D; /* Red */
 float: left;
 width:200px;}

#principal {
 height: 500px;
 background-color: #F5CF8E; /* Yellow */
 width:650px;
 float: left;}

#pie {
 height: 100px;
 background-color: #D6E9FE; /* Light blue */
 }