dify-web/app/components/explore/sidebar/app-nav-item/style.module.css

/* .item:hover, */
.item.active {
  border: 0.5px solid #EAECF0;
  box-shadow: 0px 1px 2px rgba(16, 24, 40, 0.05);
  border-radius: 8px;
  background: #FFFFFF;
  color: #344054;
  font-weight: 500;
}