Replacing Yale University logo

I need to replace the Yale University logo at the top of the site.

I downloaded the correct logo from the identity site and uploaded the new image to the site. I then added the code to the CSS injector and it’s still not showing.

#region-topper-first h1 a {
background: transparent url(../sites/default/files/images/yale-header-blue-default.png) no-repeat !important;
}