Bergen Layout - increase logo size?

Hi all, I have a website using the Bergen layout (www.cloudberryfilms.com). That layout has a fixed logo height of 150 px and I would like to increase it. You can see the logo in the centre of the home page. Apparently in 7.1 you can use elements from other layouts in your design but this is outside my skill set! Squarespace support suggest I ask in the forums. Any ideas? Thanks in advance.

add this code to Home > design > custom css to increase logo height

.header-title-logo img {
    max-height: 300px;
}

Thanks so much :)