body {
      margin: 0;
      padding: 0;
      background-image: url('../images/full_screen.png');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
    }
	
    @media (max-width: 768px) {
      body {
        background-image: url('../images/mobile_screen.png');
      }
    }