You can change the desktop viewer default hyperlink style for an entire publication by overriding the link style in HeadCSS:

.default_link{

border-bottom: solid 1px #00ccff;

margin-bottom:5px;

}

.default_link:hover {

filter: alpha(opacity=20); -moz-opacity:0.2;-khtml-opacity:0.2;opacity:0.2;

background-color: #00ccff;

}