add a css file for styling in slides and notes
add a css file for styling in slides and notes

butterflyology/rr-intro,butterflyology/rr-intro,butterflyology/rr-intro,butterflyology/rr-intro,butterflyology/rr-intro,heereman/rr-intro,Reproducible-Science-Curriculum/rr-intro,butterflyology/rr-intro