Customize blockquote tag in wiki

Main idea

How to edit html tag e.g:

in wiki site

Reading

• Community noticeboard - https://meta.miraheze.org/wiki/Community_noticeboard#How_I_change_blockquote_css%3F

How to

open MediaWiki:Common.css, example https://bimagv.miraheze.org/wiki/MediaWiki:Common.css and edit at blockquote section css.