strasbourg-2018: apply focus background change on custom select (#64463)

static/strasbourg-2018/_custom.scss

@@ -15,6 +15,14 @@
 	border: 2px solid #dddddd;
 }
 
+#rub_service .customSelectContain .customSelect {
+	transition: all, 0.5s;
+}
+
+#rub_service .customSelectContain.focused .customSelect {
+	background: white;
+}
+
 /* cancel the width: 1200px from site css */
 #content div.cell h1 {
 	width: auto;