* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  .game-board {
    width: 100%;
    height: 100vh;
    border-bottom: 16px solid rgb(28, 119, 10);
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    background: linear-gradient(#46beee, #e0f6ff);
  }
  
  .mario {
    position: absolute;
    bottom: 0;
    width: 150px;
  }
  
  .pipe {
  position: absolute;
  bottom: 0;
  width: 80px;
  height: 112px;
  animation: pipe-animation 1s infinite linear;
}

  .Obsbullet {
    position: fixed;
    bottom: 200px;
    width: 110px;
    height: 110px;
    right: -60px;
    display: none;
  }
  
  .Obsbullet.active {
    opacity: 1;
    animation: bullet-animation 0.8s linear;
  }
  
  .score,
  .high-score {
    font-family: monospace;
    font-size: 20px;
    position: absolute;
    top: 5%;
    border: 3px dashed black;
    padding: 10px;
    background-color: white;
    text-align: right;
    width: 150px;
    height: 50px;
    display: block;
    z-index: 1;
  }
  
  .score { right: 5%; }
  .high-score { left: 5%; }
  
  .game-over {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 5px dashed black;
    background-color: white;
    text-align: center;
    width: 250px;
    height: 150px;
    display: none;
  }
  
  .game-over > p {
    margin: 15px;
    font-size: 25px;
    font-family: monospace;
  }
  
  .retry {
    background: none;
    color: inherit;
    padding: 3px 5px;
    font: inherit;
    cursor: pointer;
    outline: inherit;
    margin: 15px;
    font-size: 20px;
    font-family: monospace;
  }
  
  .clouds {
    position: absolute;
    width: 550px;
    animation: clouds-animation 20s infinite linear;
  }
  
  .mountains {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 200vw;
    height: 60vh;
    pointer-events: none;
    z-index: 0;
    animation: mountains-animation 30s infinite linear;
    display: flex;
    align-items: flex-end;
  }
  
  .m1, .m2, .m3, .m4, .m5 {
    position: relative;
    border-radius: 50%;
    flex-shrink: 0;
  }
  
  .m1 {
    width: 17vw;
    height: 98vh;
    background-color: #079251;
    bottom: -16vw;
    left: 20vw;
  }
  
  .m2 {
    width: 13vw;
    height: 50vh;
    background-color: #085c35;
    bottom: -16vh;
    left: -5vw;
  }
  
  .m3 {
    width: 15vw;
    height: 50vh;
    background-color: #153b29;
    bottom: -30vh;
    left: 0vw;
  }
  
  .m4 {
    width: 18vw;
    height: 58vh;
    background-color: #085c35;
    bottom: -20vh;
    left: 56vw;
  }
  
  .m5 {
    width: 15vw;
    height: 50vh;
    background-color: #153b29;
    bottom: -30vh;
    left: 30vw;
  }
  
  @keyframes jump {
    0%   { bottom: 0; }
    40%  { bottom: 180px; }
    50%  { bottom: 180px; }
    60%  { bottom: 180px; }
    100% { bottom: 0; }
  }
  
  .jump {
    animation: jump 500ms infinite ease-out;
  }
  
  @keyframes pipe-animation {
    from { right: -80px; }
    to   { right: 100%; }
  }
  
  @keyframes bullet-animation {
    from { right: -80px; }
    to   { right: 100%; }
  }
  
  @keyframes clouds-animation {
    from { right: -550px; }
    to   { right: 100%; }
  }
  
  @keyframes mountains-animation {
    from { left: 100vw; }
    to   { left: -200vw; }
  }