website/themes/hugo-theme-monochrome/exampleSite/content/en/layouts/gallery/_index.md

title, bookcase_cover_src, bookcase_cover_src_dark, type

title	bookcase_cover_src	bookcase_cover_src_dark	type
Gallery Layout	cover/picture.png	cover/picture_dark.png	bookcase

Gallery layout is useful for demonstrating pictures and its statistical data.

This layout can be used on both section page (_index.md) and regular post (xxx.md).