*, *:after, *:before {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
  }
  
  .game-wrapper {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  
  .game-container {
    flex: 1;
    background: url("https://bhckids.org/wp-content/uploads/2015/04/background.jpg") no-repeat;
    background-size: cover;
    background-position: center center;
    display: flex;
    width: 100%;
    justify-content: center;
    position: relative;
    z-index: 500;
  }
  .game-container:after {
    content: "";
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    height: 100%;
    border-left: 2px dashed #555;
  }
  
  .game-col {
    flex: 1;
    display: flex;
    align-items: flex-end;
    max-width: 600px;
  }
  
  .computer-col {
    transform: rotateY(180deg);
    max-width: 600px;
  }
  .computer-col .cannon {
    transition: 1s ease-in;
  }
  .computer-col .cannon .pipe {
    transition: 1s ease-in;
  }
  .computer-col .cannon .wheel {
    transition: 1s ease-in;
  }
  
  .cannon {
    position: relative;
    z-index: 100;
    transform: translateX(5cm);
  }
  .cannon:before {
    content: "";
    z-index: 5;
    position: absolute;
    height: 200px;
    border-right: 1px dashed #fff;
    left: 131px;
    top: 50%;
    border-radius: 50%;
    transform: translateY(-50%);
  }
  .cannon .pipe {
    width: 160px;
    height: 40px;
    margin-bottom: 50px;
    background: linear-gradient(to right, #333 1%, #333 35%, #222 36%, #222 36%, #222 41%, #333 41%, #333 100%);
    border-radius: 0 50px 50px 0;
    position: relative;
    transform-origin: right center;
  }
  .cannon .pipe:after {
    content: "";
    position: absolute;
    width: 15px;
    height: 50px;
    background: #222;
    border: 2px solid #333;
    border-radius: 50px;
    top: 50%;
    transform: translateY(-50%);
  }
  .cannon .pipe:before {
    content: "";
    position: absolute;
    width: 120px;
    height: 60px;
    background: linear-gradient(to right, #333 1%, #333 35%, #222 36%, #222 36%, #222 41%, #333 41%, #333 100%);
    border-radius: 50% 50px 50px 50%;
    top: 50%;
    transform: translateY(-50%);
    left: 50%;
  }
  .cannon .wheel {
    position: absolute;
    width: 100px;
    height: 100px;
    color: #222;
    border: 10px solid currentColor;
    border-radius: 50%;
    bottom: 0;
    right: -21px;
    background: linear-gradient(to bottom, #752f16 93%, #1c0701 94%);
    background-size: 100% 10px;
  }
  .cannon .wheel:after {
    content: "";
    position: absolute;
    width: 35px;
    background: #111;
    height: 35px;
    left: 50%;
    top: 50%;
    border-radius: 50%;
    transform: translate(-50%, -50%);
  }
  
  .level {
    width: 60vw;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
  }
  
  .ball {
    width: 30px;
    height: 30px;
    background: #333;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
  }
  .ball:after {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    background: #333;
    border-radius: 50%;
    left: 0;
    top: 0;
  }
  
  .cm .ball:before {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -40%);
    width: 300px;
    height: 250px;
    background: url(https://www.onlygfx.com/wp-content/uploads/2017/06/comic-boom-explosion-2-1.png) no-repeat;
    background-size: 100% auto;
    z-index: -1;
    opacity: 0;
  }
  
  .fire {
    -webkit-animation: fire 0.3s ease-in-out;
            animation: fire 0.3s ease-in-out;
  }
  
  .defended .fire .ball:before {
    transition: 0.2s 0.3s linear;
    opacity: 1;
  }
  
  .wheel-handle {
    position: absolute;
    background: #fff url("https://cdn.onlinewebfonts.com/svg/img_520243.png") no-repeat;
    background-size: 100% auto;
    background-position: center;
    width: 40px;
    height: 40px;
    left: 111px;
    top: 19px;
    border-radius: 50%;
    z-index: 10;
    cursor: w-resize;
    opacity: 0.8;
  }
  
  .level-handle {
    position: absolute;
    background: #6200EA;
    width: 40px;
    height: 40px;
    left: 140%;
    top: 50%;
    border-radius: 50%;
    transform: translateY(-50%);
    z-index: 54;
    color: #fff;
    text-align: center;
    line-height: 36px;
    -webkit-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
    cursor: -webkit-grab;
    cursor: grab;
    border: 2px solid #fff;
  }
  .level-handle:after, .level-handle:before {
    content: "";
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    border: 10px solid transparent;
    border-bottom-color: #fff;
    top: -27px;
  }
  .level-handle:after {
    border: 10px solid transparent;
    border-top-color: #fff;
    top: 44px;
  }
  .level-handle:active, .level-handle:focus {
    cursor: -webkit-grabbing;
    cursor: grabbing;
  }
  
  .level-monitor {
    position: absolute;
    background: #fff;
    width: 40px;
    height: 40px;
    left: 130%;
    top: 50%;
    border-radius: 50%;
    transform: translateY(-50%) rotateY(180deg);
    z-index: 54;
    color: #333;
    text-align: center;
    line-height: 36px;
    -webkit-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
    border: 2px dashed #777;
  }
  
  .countdown {
    position: fixed;
    z-index: 5000;
    width: 100px;
    height: 100px;
    background: #fff;
    color: #00897B;
    font-size: 30px;
    font-family: arial;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 10px solid #00897B;
  }
  
  .road {
    background: #E9B7A4;
    height: 100px;
    position: relative;
  }
  
  .scale {
    display: flex;
    position: absolute;
    left: 50%;
    top: 2px;
    transform: translateX(-50%);
    -webkit-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
  }
  
  .scale-point {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
  }
  .scale-point.mirror {
    flex-direction: row-reverse;
  }
  .scale-point li {
    width: 1cm;
    position: relative;
    padding-top: 20px;
  }
  .scale-point li .unit {
    display: inline-block;
    position: relative;
    transform: translateX(-50%);
  }
  .scale-point li:before, .scale-point li:after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 1px;
    height: 17px;
    background: #000;
    transform: translateX(-50%);
  }
  .scale-point li:after {
    left: 50%;
    height: 12px;
    color: #555;
    box-shadow: 0.1cm 0, 0.2cm 0, 0.3cm 0, 0.4cm 0, -0.1cm 0, -0.2cm 0, -0.3cm 0, -0.4cm 0, 0.1cm 0, 0.2cm 0, 0.3cm 0, 0 2px #000;
  }
  
  @-webkit-keyframes fire {
    50% {
      left: 5px;
    }
  }
  
  @keyframes fire {
    50% {
      left: 5px;
    }
  }