This had me stumped for a while as I couldn’t figure out why mobile layout was broken.
You can test it here.
Mobile width
3rd section down
Personify: Block Pair (Dual Content)
change this element css
--exp02-block-pair-mobile-content-max-width: var('{{dc:p:exp02BlockPair02Setup.mobileContent.maxWidth}}');
to this
--exp02-block-pair-mobile-content-max-width: var('{{dc:p:exp02BlockPair02Setup.mobile.maxWidth}}');