body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 90vh;
  }
  
  header {
    margin-bottom: 1.5rem;
  }
  
  main {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  img {
    max-width: 500px;
}
button {
    padding: 1rem 1.5rem;
    background: linear-gradient(to bottom, #3b5998, #2f477a);
    color: #fff;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    transition: transform 0.2s ease-in-out;
    cursor: pointer;
  }
  
  button:hover {
    background: linear-gradient(to bottom, #547ed7, #486ebf);
  }
  .btn-facebook {
    background: linear-gradient(to bottom, #3b5998, #2f477a);
  }