.desktop_fix .viewport-desktop {
  background-image: url("https://ubc-eu.com/wp-content/uploads/2026/04/250404_Bianchi_ShowcaseUBC_Header_HR-1.jpg"); /* fallback */
  background-size: cover!important;
  background-position: center !important;
  background-repeat: no-repeat !important;
}

@supports (background-image: image-set(url("x.avif") type("image/avif"))) {
  .hero-section {
    background-image: image-set(
      url("https://ubc-eu.com/wp-content/uploads/2025/04/250404_Bianchi_ShowcaseUBC_Header_HR-1.avif") type("image/avif"),
      url("https://ubc-eu.com/wp-content/uploads/2026/04/250404_Bianchi_ShowcaseUBC_Header_HR-1.jpg") type("image/jpeg")
    );
  }
}