.site-nav ul li a {
  background-image: linear-gradient(-90deg, rgb(15.3636363636, 15.3636363636, 18.4363636364) 0%, rgba(15.3636363636, 15.3636363636, 18.4363636364, 0.8) 80%, rgba(15.3636363636, 15.3636363636, 18.4363636364, 0) 100%);
}