Now, let’s find out what Bootstrap 4 has to offer.
The .panel, thumbnail, and .well classes have been replaced by .card in the new Bootstrap 4. Modified classes for cards which offer similar functionality to those components. A card is: A adjustable and extensible content container. It includes options for headers and footers.
NEW BUTTONS STYLE
The buttons have a brand new style. They went flat and they have removed gradients. A .btn-outline-* classes have been introduced.
CHANGES IN TYPOGRAPHY
In the new Bootstrap 4, 16px is the new default font-size (it was 14px previously), which means that the size of the text is now bigger and more visible for the user as well as the user.
Bootstrap 4 supports four different sizes for display heading (class display-*). The following example shows the output of them:
It manages the layout quickly, navigation, alignment and sizing of grid columns, components, and more with a full suite of responsive flexbox utilities. For more complex implementations, the custom CSS may be necessary to use.