Combination of Automattic's _s theme and Bootstrap 4 by holger1411.
http://understrap.com
Frameworks · WordPress Theme
Get access to data on 22,012 websites that are UnderStrap Customers. We know of 10,582 live websites using UnderStrap and an additional 11,430 sites that used UnderStrap historically and 5,046 websites in the United States.
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Get a list of 22,012 websites using UnderStrap which includes location information, hosting data, contact details, 10,582 currently live websites and an additional 8,799 domains that redirect to sites in this list. 11,430 sites that used this technology previously and 5,046 websites in the United States currently using UnderStrap.