I notice on the Maribo demo site, the Maribo Photo header font is larger than what the default is when using the actual theme.
Font sizes may be tweaked between versions (perhaps for layout reasons) but I have just created a sample Showkase site using the current version of Showkase-Pro (v1.6.1) and the Maribo theme and the 'Site heading' and 'Site subhead' are the same size in my test site as they are in the v1.5.1 demo site here.
If you are using a version of Showkase prior to v1.5.1, then perhaps upgrading to the current version will solve your problem without any further action.
Full instructions for upgrading Showkase can be found here.
If you still want to increase the 'Site header' font size but only when Showkase is in Large Screen Mode (when the browser window is wider than 768px), then you can use a media query. Please see this Mozilla Developer Network support page for more information on using media queries: https://developer.mozilla.org/en-US/doc … ia_queries
Try adding the following CSS (adjusting the 'font-size' as necessary) to your site's 'showkase/_themes/maribo/css/custom.css' file:
@media only screen and (min-width: 768px) {
.hgroup h1 {
font-size: 60px;
}
}
I hope this helps.