style.css

body, html {
    height: 100vh;
    overflow: visible;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  .main {
    height: 100vh;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
  }
  
  .time-select, .sound-selection, .player-container {
    height: 80%;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    align-items: center;
  }
  
  .player-container {
    position: relative;
  }
  
  .player-container svg {
    position: absolute;
    height: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
  }
  
  .time-display {
    position: absolute;
    bottom: 10%;
    color: white;
    text-shadow: 1px 1px black;
    font-size: 50px;
    font-family: Arial, sans-serif;
  }
  
  video {
    position: fixed;
    top: 0%;
    left: 0%;
    z-index: -1;
    margin: 0 auto;
    min-width: 100%;
    min-height: 100%;
  }
  
  .time-select button, .sound-selection button {
    color: black;
    width: 40%;
    height: 10%;
    background: white;
    border: 4px solid white;
    font-family: Arial, sans-serif;
    font-size: 1.2em;
    font-weight: bold;
    cursor: pointer;
    border-radius: 10px;
    opacity: 0.7;
  }
  
  .time-select button:hover {
    color: white;
    background: none;
  }
  
  .sound-selection button:hover {
    color: white;
    background: none;
  }
  
  @media only screen and (max-device-width: 480px) {
    .player-container svg {
      position: absolute;
      height: 25%;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      pointer-events: none;
    }
  
    img.play {
      height: 12%;
    }
  
    .time-select button, .sound-selection button {
      color: black;
      width: 50%;
      height: 10%;
      background: white;
      border: 4px solid white;
      font-family: Arial, sans-serif;
      font-size: 12px;
      font-weight: bold;
      cursor: pointer;
      border-radius: 10px;
      opacity: 0.7;
    }
  
  }