#game {
    width: 800px;
    height: 600px;
    border: 1px solid black;
    position: relative;
    margin: 0 auto;
    overflow: hidden;
}
#player {
    width: 50px;
    height: 50px;
    background-image: url("images/player.png");
    background-repeat: no-repeat;
    background-size: contain;
    position: absolute;
    bottom: 0;
    left: 375px;
}
.enemy {
    width: 50px;
    height: 50px;
    background-image: url("images/enemy.png");
    background-repeat: no-repeat;
    background-size: contain;
    position: absolute;
}
.bullet {
    width: 5px;
    height: 15px;
    background-color: white;
    position: absolute;
}
#boss {
    width: 200px;
    height: 200px;
    background-image: url("images/boss.png");
    background-repeat: no-repeat;
    background-size: contain;
    position: absolute;
    bottom: 550px;
    left: 300px;
    display: none;
}
#bossBullets {
    width: 800px;
    height: 600px;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
}