The maintainer will need to go to http://www.dreamwidth.org/customize/options?group=style and pick "1 em" for "Size of base font" and "Units for base font size", so that it will use your browser's default font size. This is part of a change we made to be more accessible and it seems that a few layouts are having problems if you'd previously customized certain settings. There's more info at http://dw-styles.dreamwidth.org/15428.html.