fix up a few more colours

src/skins/vector/css/themes/_base.scss

@@ -7,6 +7,9 @@ $primary-bg-color: #ffffff;
 // used for dialog box text
 $light-fg-color: #747474;
 
+// used for focusing form controls
+$focus-bg-color: #dddddd;
+
 // button UI (white-on-green in light skin)
 $accent-fg-color: #ffffff;
 $accent-color: #76CFA6;