#topbar img {
position: absolute;
top: 0;
padding: 0;
text-align: center;
height: 25px;
left: 0;
z-index: 1;
border: none;
}
#bomb img {
position: absolute;
 top:25%;
    right:25%;
    bottom:25%;
    left:25%;
z-index: 2;
background: url('images/bomb.png') no-repeat;
border: none;
}