*, *::before, *::after {
    box-sizing: border-box;
    outline: none;
  }
  
  h1, h2, h3, h4, h5, h6, p {
    margin: 5px 0;
  }
  
  body {
    margin: 0;
    padding: 0;
  }
  
  .intro {
    width: 100%;
    min-height: 100vh;
    position: relative;
  }
  .intro .animated-bar {
    width: 0;
    height: 3px;
    background: #fff;
    z-index: 9999;
    position: absolute;
    top: 0;
    left: 0;
    -webkit-animation: bar 5s 3 linear;
            animation: bar 5s 3 linear;
  }
  .intro .slide {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: black;
    position: absolute;
    top: 0;
    left: 0;
    padding: 20px;
    overflow: hidden;
  }
  .intro .slide.slide-a {
    background-image: url("../img/bg.jpg");
    z-index: 400;
  }
  .intro .slide.slide-a .slide-a-child {
    transform: translateY(50px);
    opacity: 0;
    transition: all 1s;
  }
  .intro .slide.slide-a .slide-a-child.is-visible {
    transform: translateY(0);
    opacity: 1;
  }
  .intro .slide.slide-a p {
    font-size: 25px;
  }
  .intro .slide.slide-b {
    background-image: url("../img/bg.jpg");
    z-index: 300;
  }
  .intro .slide.slide-b h2 {
    transform: translateX(50px);
  }
  .intro .slide.slide-b p:first-of-type {
    transform: translateX(-50px);
    margin-bottom: 20px;
  }
  .intro .slide.slide-b p:last-of-type {
    transform: translateX(50px);
  }
  .intro .slide.slide-b .slide-b-child {
    transition: all 1s;
    opacity: 0;
  }
  .intro .slide.slide-b .slide-b-child.is-visible {
    transform: translateX(0);
    opacity: 1;
  }
  .intro .slide.slide-c {
    background-image: url("../img/bg.jpg");
    z-index: 200;
  }
  .intro .slide.slide-c .slide-c-child {
    transition: all 1s cubic-bezier(0.25, 0.25, 0.23, 1.405);
    transform: scale(0.5);
    opacity: 0;
  }
  .intro .slide.slide-c .slide-c-child.is-visible {
    transform: scale(1);
    opacity: 1;
  }
  .intro .slide.slide-d {
    background-image: url("../img/bg.jpg");
    z-index: 100;
  }
  .intro .slide.slide-d .slide-d-child {
    transition: all 1s;
    opacity: 0;
    transform: translateY(-50px);
  }
  .intro .slide.slide-d .slide-d-child.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
  .intro .slide.slide-d button.slide-d-child {
    transform: translateY(50px);
  }
  .intro .slide .slide-content {
    text-align: center;
    color: #18d26e;
    font-family: "Raleway", sans-serif;
  }
  .intro .slide .slide-content h1 {
    font-size: 70px;
    font-weight: 400;
    margin: 20px 0;
  }
  .intro .slide .slide-content h2 {
    font-size: 60px;
    font-weight: 400;
    margin: 20px 0;
  }
  .intro .slide .slide-content p {
    font-size: 25px;
    font-weight: 300;
  }
  .intro .slide .slide-content p a {
    color: #fff;
    text-decoration: none;
    position: relative;
  }
  .intro .slide .slide-content p a:hover::after {
    width: 180px;
  }
  .intro .slide .slide-content p a::after {
    content: "";
    width: 0;
    height: 1px;
    background: #18d26e;
    display: block;
    position: absolute;
    bottom: -3px;
    left: 0;
    transition: all 0.5s;
  }
  .intro .slide .slide-content ul li {
    display: inline-block;
  }
  .intro .slide .slide-content ul li p {
    position: relative;
  }
  .intro .slide .slide-content ul li p::after {
    content: "";
    width: 8px;
    height: 8px;
    background: #fff;
    display: inline-block;
    margin: 0 20px;
    border-radius: 50%;
  }
  .intro .slide .slide-content ul li:last-of-type p::after {
    display: none;
  }
  .intro .slide .slide-content button {
    width: 120px;
    height: 120px;
    line-height: 120px;
    border: none;
    color: #fff;
    border-radius: 50%;
    text-align: center;
    background: #18d26e;
    margin-top: 30px;
    border: 2px solid transparent;
    transition: all 0.5;
    cursor: pointer;
    font-size: 18px;
    font-family: "Raleway", sans-serif;
    transition: all 0.5s;
  }
  .intro .slide .slide-content button:hover {
    background: none;
    border: 2px solid #fff;
    color: #fff;
  }
  
  @-webkit-keyframes bar {
    0% {
      width: 0;
    }
    100% {
      width: 100%;
    }
  }
  
  @keyframes bar {
    0% {
      width: 0;
    }
    100% {
      width: 100%;
    }
  }
  @media (max-width: 991px) {
    h1 {
      font-size: 50px !important;
    }
  
    h2 {
      font-size: 45px !important;
    }
  
    p {
      font-size: 22px !important;
    }
    p a:hover::after {
      width: 160px !important;
    }
  }
  @media (max-width: 768px) {
    .slide-c-child {
      display: block !important;
    }
  
    p::after {
      display: none !important;
    }
  
    button.replay {
      width: 80px !important;
      height: 80px !important;
      line-height: 80px !important;
      font-size: 14px !important;
    }
  
    a:hover::after {
      width: 140px !important;
    }
  }
  @media (max-width: 480px) {
    h1 {
      font-size: 40px !important;
    }
  
    h2 {
      font-size: 33px !important;
    }
  
    p {
      font-size: 18px !important;
    }
    p a:hover::after {
      width: 130px !important;
    }
  }