.cloud {
    background-image: url('cloud.png');
    background-repeat: no-repeat;
    background-size: contain;
    width: 20%;
    height: 20%;
    z-index: 100;
}

.star-small {
    background: #F2F2F2;
    height: 1px;
    width: 1px;
}
.star-med {
    background: #F2F2F2;
    height: 2px;
    width: 2px;
}
.star-small2 {
    background: #F2F2F2;
    height: 2px;
    width: 1px;
}
.star-small3 {
    background: #F2F2F2;
    height: 1px;
    width: 2px;
}

.ship {
    background: url('galaga.png') no-repeat -32px -62px;
	width: 15px;
	height: 16px;
}

.missile {
    background: url('galaga.png') no-repeat -202px -202px;
	width: 3px;
	height: 8px;
}

.e11 {
    background: url('galaga.png') no-repeat -8px -111px;
    width: 15px;
    height: 15px;
}

.e12 {
    background: url('galaga.png') no-repeat -32px -110px;
	width: 15px;
	height: 16px;
}

.e21 {
    background: url('galaga.png') no-repeat -11px -161px;
    width: 9px;
    height: 10px;
}

.e22 {
    background: url('galaga.png') no-repeat -33px -161px;
    width: 13px;
    height: 10px;
}

.e31 {
    background: url('galaga.png') no-repeat -11px -185px;
	width: 9px;
	height: 10px;
}

.e32 {
    background: url('galaga.png') no-repeat -33px -185px;
    width: 13px;
    height: 10px;
}

.ex1 {
    background: url('galaga.png') no-repeat -202px -231px;
	width: 12px;
	height: 13px;
}
.ex2 {
    background: url('galaga.png') no-repeat -224px -230px;
	width: 16px;
	height: 16px;
}