various minor updates re: icons

css/defines.less

@@ -45,6 +45,7 @@ body.ttrss_prefs,
   font-size: 18px;  /* Preferred icon size */
   display: inline-block;
   line-height: 1;
+  color : #ccc;
   text-transform: none;
   letter-spacing: normal;
   word-wrap: normal;