Barcelonia CSS Fix
Tumblr completely changed how they do photosets, which kind of made them ugly for Barcelonia users.
You can fix this by adding this code to your “Custom CSS” area. Go to Customize your Theme, then under “Advanced” then add the code to “Add custom CSS”.
.html_photoset iframe { width: 100% }
If this does not work, go to “Edit HTML” and look for “Custom CSS.” Paste this code under that and you’re done.
I’ve submitted this fix to tumblr, but they’re very slow to update this stuff. So I highly recommend doing it manually instead of waiting.