Don’t show logo on multiple themes

Hi,
first of all, thank you for your work, when I had to choose my first theme, I landed on Bjork and loved it, and when I looked for the second one, I found out that Hitchcock was yours too, so, I love your taste and your work.
Sorry to bother you for something that maybe a professional could do in no time, but I’m using “multiple themes” plugin in order to have my main site with the Bjork theme, and for a single project, I would love to have another feeling, using Hitchcock.
My problem is that while in the main site the logo is essential and needs to be shown, in the Hitchcock pages I would love to hide it. If I remove it, it’s removed from the entire site, so the Bjork pages won’t display it, and if I modify Hitchcock’s css style sheet switching custom-logo-link img to display:none

.custom-logo-link,
.custom-logo-link img { 
	display: none; 
}

it still shows the logo.
Sorry again for my bothering you, but I hope this could help other newbies like me too.
Thanks and keep up the great work!

The page I need help with: [log in to see the link]