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;
}