increased line-height and use a lighter bg color in help tooltips

extension/ui/pages/options.css

@@ -114,8 +114,8 @@ h3 a {
     border: 1px #bfbfbf dotted;
     border-radius: 4px;
     padding: 2px;
-    background-color: #fffcc1;
-    line-height: 1.4em;
+    background-color: #fffdde;
+    line-height: 1.6em;
 }
 
 .help-content img {