GitHub - peterdanis/custom-bootstrap-cards: Custom Bootstrap 4 cards. I took inspiration from custom Foundation 6 cards, polished and reworked them to Bootstrap 4.
Bootstrap 4 responsive card design example
Bootstrap Cards designs, themes, templates and downloadable graphic elements on Dribbble
Responsive Cards with Bootstrap 4 and Css - YouTube
Bootstrap 4 snippet - cards grid product items
css - How can I add space between Bootstrap card elements? - Stack Overflow