Missing Breakpoint for 4col container

Riona Kuthe reported an issue

The four column content should be changed to 2-col between 768px-1200px Browser width to guarantee enough width for the content. Thanks for fixing it. Riona

Reported URL:https://new.typo3.org/project/brand/style-guide/

User Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36