Welcome Developers, we will see bootstrap 4 card tutorial. bootstrap 4 card slider. Bootstrap 4 Cards A card is a flexible and extensible content container. It includes options for headers and footers, a wide variety of content, contextual background colors, and powerful display options. Card Body Need a set of equal width and height cards that aren’t attached to one another? Use card decks. Body The building block of a card is the .card-body. Use it whenever you need a padded section within a card. Card Titles, text, and links Card titles are used by adding .card-title to an h tag. In the same way, links are added and placed next to each other by adding .card-link to a tag.