.site-header {
  position: fixed;
  z-index: 20;
  transition: background-color .25s ease, box-shadow .25s ease, height .25s ease;
}

.site-header.is-scrolled {
  height: 96px;
  background: #080808;
  box-shadow: 0 8px 25px rgba(0, 0, 0, .22);
}

.products-nav.is-scrolled {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 50%;
  width: 100%;
  max-width: none;
  padding: 18px max(36px, calc((100% - 1440px) / 2));
  transform: translateX(-50%);
  background: #080808;
  border-color: transparent;
  box-shadow: 0 8px 25px rgba(0, 0, 0, .22);
}

@media (max-width: 700px) {
  .site-header.is-scrolled {
    height: 72px;
  }
}

@media (max-width: 960px) {
  .products-nav.is-scrolled {
    padding: 18px 22px;
  }
}