body, html {
  margin: 0;
  padding: 0;
  background-color: #21179A;
}

.responsive-image {
  width: 100%;
  height: 100vh; /* puedes ajustar esto si quieres otro alto */
  background-size: contain;
  background-position: top;
  background-repeat: no-repeat;
  background-image: url('desktop.webp');
}

/* Para pantallas móviles */
@media (max-width: 768px) {
  .responsive-image {
    background-image: url('mobile.webp');
  }
}