Code list buttons not visible

[herrtunante]

When using the 100% (standard zoom) in Chrome.
When clicking on a code list editing button next to a a code attribute selector or available code lists
When the code list is not hierarchical, only one list of codes shown (i.e. the list of years of LU change)
Dialog appears, but the list of codes is not scrollable and the button to add new codes is not visible!