* {
    font-family: Google sans, Arial;
  }
  
  html, body {
    margin: 0;
    padding: 0;
  }
  
  .flex-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: white;
    animation: colorSlide 15s cubic-bezier(0.075, 0.82, 0.165, 1) infinite;
  }
  .flex-container .text-center {
    text-align: center;
  }
  .flex-container .text-center h1,
  .flex-container .text-center h3 {
    margin: 10px;
    cursor: default;
  }
  .flex-container .text-center h1 .fade-in,
  .flex-container .text-center h3 .fade-in {
    animation: fadeIn 2s ease infinite;
  }
  .flex-container .text-center h1 {
    font-size: 8em;
    transition: font-size 200ms ease-in-out;
    border-bottom: 1px dashed white;
  }
  .flex-container .text-center h1 span#digit1 {
    animation-delay: 200ms;
  }
  .flex-container .text-center h1 span#digit2 {
    animation-delay: 300ms;
  }
  .flex-container .text-center h1 span#digit3 {
    animation-delay: 400ms;
  }
  .flex-container .text-center button {
    border: 1px solid white;
    background: transparent;
    outline: none;
    padding: 10px 20px;
    font-size: 1.1rem;
    font-weight: bold;
    color: white;
    text-transform: uppercase;
    transition: background-color 200ms ease-in;
    margin: 20px 0;
  }
  .flex-container .text-center button:hover {
    background-color: white;
    color: #555;
    cursor: pointer;
  }
  
  @keyframes colorSlide {
    0% {
      background-color: #152a68;
    }
    25% {
      background-color: royalblue;
    }
    50% {
      background-color: seagreen;
    }
    75% {
      background-color: tomato;
    }
    100% {
      background-color: #152a68;
    }
  }
  @keyframes fadeIn {
    from {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }