Thank you Eric. Well, the Custom Header section of the theme specifies that the logo should be 360 × 164, so that is the size we made our logo.
We added the CSS above under “/* Logo, hide text */” on line 2039 below .header-image .site-title a {
We don’t have a screen that’s 800×600 or an older iphone handy, so we will have to get back to you on whether that worked. Thank you