body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: #121212;
    color: #fff;
  }
  
  #titulo {
    font-family: 'Times New Roman', Times, serif;
  }

  #uno {
    margin-bottom: 60px;
  }

  header {
    background-color: #09e5aee7;
    color: #fff;
    padding: 40px 20px;
    text-align: center;
  }
  header h1 {
    margin: 0;
    font-size: 2.5em;
  }
  
  .descripcion {
    max-width: 800px;
    margin: 20px auto 0;
    padding: 20px;
    background-color: #121212;
    border-radius: 10px;
  }
  .descripcion h1,
  .descripcion h2 {
    color: #06aa73;
    text-align: center;
  }
  .descripcion p {
    font-size: 1.1em;
    line-height: 1.7;
    margin: 15px 0;
  }
  .descripcion ul {
    list-style-type: disc;
    margin-left: 20px;
    padding-left: 20px;
    line-height: 1.7;
  }

  .descripcion ul ul {
    list-style-type: circle;
    margin-left: 20px;
  }
  
  main {
    padding: 20px;
    flex: 1;
  }
  .tarjetas {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: stretch;
    padding: 40px 0;
  }
  .tarjeta {
    background-color: #1c1c1c;
    border: 1px solid #e70892;
    border-radius: 10px;
    width: 300px;
    margin: 20px;
    padding: 20px;
    text-align: center;
    transition: box-shadow 0.3s;
    color: #fff;
  }
  .tarjeta:hover {
    box-shadow: 0 4px 8px #ec0292;
  }
  .tarjeta h3 {
    font-size: 1.5em;
    color: #06aa73;
    margin-bottom: 15px;
  }
  .tarjeta p {
    font-size: 1em;
    margin-bottom: 20px;
  }
  .tarjeta a {
    display: inline-block;
    padding: 10px 20px;
    background-color: #08bb8e;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
  }
  .tarjeta a:hover {
    background-color: #1a7c5b;
  }
  
  footer {
    background-color: #000;
    color: #fff;
    text-align: center;
    padding: 50px 0;
    overflow: hidden;
    position: relative;
  }
  .marquee {
    display: flex;
    position: absolute;
    left: 0;
    top: 50%;
    animation: marquee 13s ease-in-out infinite;
  }
  .shape {
    margin: 0 20px;
    animation: spin 4s linear infinite;
  }
  .square,
  .circle {
    width: 50px;
    height: 50px;
    background-color: #FF69B4;
  }
  .circle {
    border-radius: 50%;
  }
  .triangle {
    width: 0;
    height: 0;
    border-left: 25px solid transparent;
    border-right: 25px solid transparent;
    border-bottom: 50px solid #FF69B4;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  @keyframes marquee {
    0%, 100% { transform: translateY(-50%) translateX(0); }
    50% { transform: translateY(-50%) translateX(calc(100vw - 100%)); }
  }