Only top of logo is a link

Hello. Only the top half of the logo on one of our websites is linking. How can I make the entire logo a link?

I am using various CSS to adjust the logo and the menu, such as:

/*Moves vertical location of logo:*/
strong.logo {
top: 5px;
}

/*adjust height of the glassy header */
.html_header_top.html_bottom_nav_header #header_main, .html_header_top.html_bottom_nav_header #header {
    max-height: 186px;
}

#menu-item-407, #menu-item-553, #menu-item-362 {
left: 164px;
}

#menu-item-554, #menu-item-546, #menu-item-366 {
left: -101px;
}

/*Moves vertical location of menu items:*/
div#header_main_alternate {
top: -55px;
}

and

ul#avia-menu { position: relative; top: -50px; }
#header_main_alternate { z-index: 4; }