html, body {
    margin: 0;
    height: 100%;
    overflow: hidden;
    background-color: black !important;
  }
  #content {
    position: relative;
    width: 100vw;
    height: 100vh;
    background-color: black !important;
  }
  #thefile { 
    position: fixed; 
    top: 80px; 
    left: 15px; 
    z-index: 10;
    color: white;
  }
  #audio { 
    position: fixed; 
    top: 10px; 
    left: 10px; 
    z-index: 10; 
    max-width: 40vw;
    color: white;
  }
  #nextMode {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 3;
    padding: 8px 14px;
    border: 1px solid white;
    color: white;
    background: rgba(0,0,0,0.4);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
  }
  #nextMode:hover {
    background: rgba(255,255,255,0.1);
  }