[Theme Horse Support Team]

Ok then you can add the background-color properties on the both above code.
Like:-

.site-content .newscard-widget-recent-posts .nav-link {
	color: black;
	background-color: red;
}
.site-content .newscard-widget-recent-posts .nav-link:hover,
.site-content .newscard-widget-recent-posts .nav-link.active {
	color: blue;
	background-color: green;
}

Thanks