Hello

Things works but you can not see it in the wysiwyg editor

I'm trying to edit the Typography.css file and it is working exept for this :

I want people to be able to add an image on the right side of a titlle so I did this :

but I can't see changes in the wysiwyg

.typography h3 {
font-family: Georgia, "Times New Roman", Times, serif;
   color: #222;
   margin: 0 0 18px 0;
   font-weight: 300;
   clear: both;
   font-size: 18px;
   background: white url(../images/side_menu_black_rectangle.gif) no-repeat right center;
}

Thanks a lot