body {
      font-family: Arial, sans-serif;
      text-align: center;
      padding: 50px;
      background-color: #f5f5f5;
    }
    h1 {
      margin-bottom: 40px;
    }
    .boton {
      display: inline-block;
      margin: 15px;
      padding: 20px 40px;
      background-color: #2baf8b;
      color: white;
      text-decoration: none;
      border-radius: 10px;
      font-size: 20px;
      transition: background-color 0.3s ease;
    }
    .boton:hover {
      background-color: #21876a;
    }
    /* Botones para actividades inactivas (si quieres usarlos) */
    .boton.inactivo {
      background-color: #aaa;
      pointer-events: none;
      cursor: default;
    }
    /* Botón para volver */
    .volver {
      display: inline-block;
      margin-top: 50px;
      padding: 10px 20px;
      background-color: #555;
      color: white;
      text-decoration: none;
      border-radius: 8px;
      font-size: 16px;
      transition: background-color 0.3s ease;
    }
    .volver:hover {
      background-color: #333;
    }