body {
      margin: 0;
      padding: 0;
      height: 100vh;
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      /* transition: background-image 0.3s ease-in-out; */
    }

    /* Fondo por defecto: Desktop (Full HD 1920x1080) */
    body {
      background-image: url(img/creueta_web.png);
    }

    /* Tablet (entre 768px y 1024px aprox) */
    @media (max-width: 1024px) and (min-width: 768px) {
      body {
        background-image: url(img/creueta_tablet.png);
      }
    }

    /* Móvil (hasta 767px) */
    @media (max-width: 767px) {
      body {
        background-image: url(img/creueta_movil.png);
      }
    }