.game-container{
    width:500px;
    height:730px;
    left:80px;
    position:absolute;
    }
    .body{
        display:flex;
    }
    .border-left{
        width:80px;
        height:790px;
        position:absolute;
        background-color: white;
        z-index:+2;
        
    }
    .border-right{
        width:80px;
        height:790px;
        position:absolute;
        background-color: white;
        z-index:+2;
        left:580px;
    }
    .border-top{
        width:660px;
        height:50px;
        position:absolute;
        background-color: white;
        z-index:+2;
        top:-50px;
    }
    .sky{
        background-image:url('fb-game-background.png');
        width:500px;
        height:580px;
        position:absolute;
    }
    .ground{
        background-image:url('bottom-background.png');
        width:500px;
        height:150px;
        position:absolute;
        top:580px;
        z-index:+1;
    }
    .bird{
        background-image:url('flappy-bird.png');
        width:60px;
        height:45px;
        position:absolute;
        left:220px;
        bottom:100px;
    }
    .obstacle{
        background-image:url('flappybird-pipe.png');
        position:absolute;
        width:60px;
        height:300px;
    }
    .topObstacle{
        background-image:url('flappybird-pipe.png');
        position:absolute;
        transform:rotate(180deg);
        width:60px;
        height:300px;
    }
    .ground-container {
        height: 150px;
        width: 580px;
        left: 80px;
        position:  absolute;
    }
    @keyframes slideright {
        from {
            background-position: 10000%;
        }
        to {
            background-position: 0%;
        }
      }
      
      @-webkit-keyframes slideright {
        from {
            background-position: 10000%;
        }
        to {
            background-position: 0%;
        }
      }
    .ground-moving {
      position: absolute;
      top: 580px;
      height: 150px;
      background-image: url('bottom-background.png');
      background-repeat: repeat-x;
      animation: slideright 100s infinite linear;
      -webkit-animation: slideright 100s infinite linear;
      width: 100%;
      z-index: +1;
    }