looks.css

body, html {
  margin: 0;
  padding: 0;
  overflow: hidden;
  
  height: 100dvh;
  background-color: rgb(6, 5, 27);

  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.isBullet {
  width: 16px;
  height: 16px;
  position: absolute;
  
  background-color: aquamarine;
  border-radius: 100%;
  box-shadow: 0 0 60px 10px aqua;
}

.enemyShip {
  width: 50px;
  height: 50px;
  
  background-image: url('img/enemy_spaceship.png');
  background-size: cover;
  
  position: absolute;
}

#playButton {
  width: 120px;
  height: 40px;
  margin-bottom: 6px;
  font-size: medium;
  border-radius: 8%;
}

#spaceship {
  width: 60px;
  height: 60px;

  background-image: url('img/spaceship.png');
  background-size: cover;

  position: absolute;
  bottom: 10%;
}

#gameScore {
  color: white;
  font-family: Arial, Helvetica, sans-serif;
}

#gameBoundary {
  width: 500px;
  height: 800px;
  border: 2px solid rgb(255, 255, 255);

  background-image: url('img/space.jpg');
  background-size: cover;
  background-repeat: repeat-y;

  position: relative;
}