dbrowse.prg
dbedit.prg
You can see that there is the bootstrap link in the head section and then the javascript include.
After this the calls to che classes "container-fluid", "col-xs-6", "btn-group", "btn btn-default" are related to bootstrap.
Every class is automatically positioned in certain points of the screen. But you will understand better if you look this
video
https://www.youtube.com/watch?v=0tv85fkdV14The big advantage is that you can design a form and this is placed always in a certain point of the screen, with the size
auto-adapted. And everything you put in that form too. When you run the examples you can stretch the browser size and
you can see that the content is adapted to new screen layout.