div { position:relative; width:250px; height:100px;
 
border:5px solid #000;
color:black; 
font-weight:bold; 
text-align:center;
}
div#d1 { background-color:red;
}
div#d2 { background-color:green; }
div#d3 { background-color:blue;
}
div#d4 { background-color:yellow; }