This will reduce the height of the Join / Login buttons. You can adjust the width below too. I was just tired of the cartoonish-big buttons and decided to reduce them.
Upload this image to:
templates/base/images/
edit templates/base/css/top_menu.css
.subMenuOvr .sys_tm_actions input.submit {
min-width: 98px;
width: 98px;
padding: 3px 6px 32px;
background-image: none;
font-size: 14px;
}
