Neither of these change the logo hover option.
Do I need to modify the theme’s actual header.php file or can I add this to custom css?
I believe that the element is called ‘site-logo’ and is only really mentioned once in the theme .php file.
<a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php bloginfo('name'); ?>"><img class="site-logo" src="<?php echo esc_url(get_theme_mod('site_logo')); ?>" alt="<?php bloginfo('name'); ?>" /></a>
