Show currently selected nav item

sass/_nav.scss

@@ -61,6 +61,11 @@ nav {
 		display:flex;
 		justify-content:center;
 		background:$nav-background-secondary;
+
+		a.active {
+			color: $nav-anchor-hover-color;
+			background-color: $nav-background-primary;
+		}
 	}
 }