/**
 * The first commented line is your dabblet’s title
 */
body{
background-color:tan;
min-height: 100%;
}

div.a{
width:800px;
height:400px;
background-color:red;
position:relative;
}
div.orange{
width:60px;
height:60px;
background-color:orange;
position:absolute;
}
div.yellow{
width:30px;
height:30px;
background-color:yellow;
position:absolute;
}