It looks like you’re using an older version of Epik, so that means you’ll have to change some things in your files in order to make this work. Since you’ve already made changes to your CSS files, DO NOT UPDATE your theme, it will overwrite your current design (you may already know this).
What you could do is update your Header/Logo code in your functions file to this –
//* Add support for custom header
add_theme_support( 'custom-header', array(
'flex-height' => true,
'width' => 360,
'height' => 164,
'header-selector' => '.site-title a',
'header-text' => false,
) );
That’s the latest/newest way that Genesis is adding/uploading Logos to the Genesis Framework.
Once you do that, let me know, and I can tell you the next step. Also, make sure everything uploads properly by entering the right Image size.