Hi everyone, I'm setting up a mail server with Roundcube for my new hair salon, and I'm having a bit of trouble with the visual customization. My goal is to adapt the "Elastic" theme so it matches my brand's visual identity, which features a lot of technical designs inspired by Japanese scissors (like the Green Mouse, with fairly slender, ergonomic curves). Is it better to create a separate "skin" folder to override the existing CSS, or should I modify the skins/elastic/ directory directly? I'm worried that a Roundcube update might overwrite my changes if I don't do this properly.