body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #000;
  }
  canvas {
    position: absolute;
    top: 0;
    left: 0;
  }
  #time {
    position: absolute;
    top: 10%;
    left: 0;
    width: 100%;
    text-align: center;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    font-size: 64px;
    color: rgba(255, 255, 255, 0.8);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
  }
  #date {
    position: absolute;
    top: calc(10% + 70px);
    left: 0;
    width: 100%;
    text-align: center;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    font-size: 18px;
    color: rgba(255, 255, 255, 0.6);
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.3);
  }
  #theme-menu {
    position: absolute;
    top: 50%;
    right: -180px;
    transform: translateY(-50%);
    width: 200px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px 0 0 10px;
    padding: 20px;
    transition: right 0.3s ease;
  }
  #theme-menu:hover {
    right: 0;
  }
  .theme-option {
    margin: 10px 0;
    padding: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    color: white;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    cursor: pointer;
    transition: background 0.3s ease;
  }
  .theme-option:hover {
    background: rgba(255, 255, 255, 0.2);
  }