make active row in autocomplete proposals better visible

pdb-ui/src/main/resources/resources/css/design.css

@@ -41,6 +41,10 @@ html, body {
 	flex-basis: auto;
 }
 
+#search-bar .autocomplete .active {
+	background-color: #AAA;
+}
+
 #filter-bar {
 	
 }