html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: 'Comic Relief', sans-serif;
  background: linear-gradient(180deg, #002d50, #295467);
  color: white;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  }

  nav {
  width: 90%;
  max-width: 800px;
  margin: 10px auto;
  padding: 0px 0;
  text-align: center;
  background: rgba(0, 0, 0, 0.096);
  z-index: 10;
  flex-shrink: 0;
  border-radius: 32px;
  outline: 2px solid #ffffff;
  outline-offset: -1px;
  }

  nav a {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 12px 20px;
  text-decoration: none;
  font-weight: bold;
  border-radius: 18px;
  transition: all 0.2s ease;
  transform: scale(0.90);
  }

  nav a:hover {
  background: rgba(255, 255, 255, 0.103);
  color: #ffffff;
  border-radius: 18px;
  transform: scale(0.80);
  }

  #content {
  flex: 1;
  padding: 20px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  }

  #content::-webkit-scrollbar {
  display: none;
  }

  #content button[data-theme] {
  background: rgba(0, 0, 0, 0.096);
  color: #ffffff;
  border-radius: 18px;
  font-size: 50px;
  padding: 95px 95px;
  margin: 5px;
  font-weight: bold;
  font-family: 'Comic Relief', sans-serif;
  cursor: pointer;
  transition: all 0.25s ease;
  outline: 2px solid #ffffff;
  outline-offset: -1px;
  }

  #content button[data-theme]:hover {
  background: rgba(0, 0, 0, 0.096);
  color: #fff;
  transform: scale(0.95);
  }

  h1 {
  text-align: center;
  margin: 10px auto;
  max-width: 90%;
  }

  h2 {
  text-align: center;
  margin: 10px auto;
  max-width: 90%;
  }

  p {
  text-align: center;
  margin: 10px auto;
  max-width: 90%;
  }

  iframe {
  display: block;
  margin: 30px auto;
  border-radius: 10px;
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16 / 9;
  height: auto;
  outline: 4px solid #ffffff;
  outline-offset: -3px;
  }

  footer {
  width: 90%;
  max-width: 800px;
  margin: 10px auto;
  color: white;
  text-align: center;
  padding: 0px 0;
  font-size: 14px;
  z-index: 10;
  background: rgba(0, 0, 0, 0.3);
  flex-shrink: 0;
  border-radius: 32px;
  outline: 2px solid #ffffff;
  outline-offset: -1px;
  }

  a {
  color: #69d2ff;
  font-weight: none;
  text-decoration: none;
  }

  a:hover {
  color: #ffffff;
  }

  body {
  opacity: 0;
  transition: opacity 0.4s ease;
  }

  body.fade-in {
  opacity: 1;
  }

  body.fade-out {
  opacity: 0;
  }

  @media (max-width: 768px) {
    nav a {
      padding: 10px 8px;
      font-size: 14px;
    }

    h1 {
      font-size: 24px;
      margin: 12px auto;
    }

    h2 {
      font-size: 20px;
      margin: 10px auto;
    }

    p {
      font-size: 16px;
      margin: 8px auto;
    }

    iframe {
      max-width: 100%;
    }

    footer {
      font-size: 12px;
      padding: 8px 10px;
    }
  }