.site-nav ul li a {
  background-image: linear-gradient(-90deg, rgb(155.8727272727, 124.332231405, 249.367768595) 0%, rgba(155.8727272727, 124.332231405, 249.367768595, 0.8) 80%, rgba(155.8727272727, 124.332231405, 249.367768595, 0) 100%);
}