Fix gradient overlap issue on homepage

This fixes the issue I reported in (and wrongly attributed to) [7f99483ba6a92af7df3c7dcc7a2d4fe7473e5fe1](https://github.com/sarahsemark/flare/commit/7f99483ba6a92af7df3c7dcc7a2d4fe7473e5fe1#commitcomment-5291429)