.footer {
    background-color: #1c1c1c;
    color: white;
    padding: 15px;
    text-align: center;
    font-size: 0.9rem;
  }
  .imagen-principal {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
  }
  
  .imagen-principal img {
    max-width: 100%;
    height: auto;
    display: block;
  }