.bullet {
	width:20px;
	height:20px;
	position:absolute;
    background:url(../images/bullet.png);
	background-size: 100% 100%;
}
.enemyBullet {
	width:20px;
	height:20px;
	position:absolute;
    background:url(../images/enemyBullet.png);
	background-size: 100% 100%;
}