I played a bit around with Source and like it very much, but I found a small incompatibility with the BreadcrumbsThing stack (@Marten). As soon as I add the ‘Source’ stack to the stacks page (Source theme), the bottom end of the “breadcrumb” line isn’t properly clipped and shows some artefact. It might have to do with line heights and your rem-definition to be 10 px, unfortunately I couldn’t find the right setting to fix the problem.
BreadcrumbThing w/o the ‘source’ base stack added:
BreadcrumbThing w/ the ‘source’ base stack added - creates bottom artefact:
Thanks for your help