Spawn/add and delete/remove items in Bootstrap 4 grid columns, and equalize the height of the spawn button.
Or if you feel like playing around with the code, I've set up two pens as well on CodePen:
This example is built upon the following libraries:
Except where otherwise noted, all original content here are released under MIT license. However, part of the work here are derived from other open source projects and as a result follow the licenses of their original sources.