need tall logo on top

Hello, I just updated theme (2.9.1), plugins and WP (all current) on my dev site.
My logo is not displaying on top anymore. see http://dev.gemcovalve.com/
See live website for how the logo should look (using theme 2.5.4) http://gemcovalve.com/
I have custom css (see below) that worked before updating the theme.
.social_header #top .logo, .logo a {
display: block;
height: 175px;
width: 164px;
background-color: #FFF;
border: 0px none;
margin-left: 5px;
}
Can you please give me the correct css to make the logo appear on top?
Thanks, Deb