Koha has long had a style applied broadly to input tags of type input, button, and reset. We have not been consistently moving to use the Bootstrap "btn-primary" class. Now that the staff interface has a more specific style for this kind of button it would be good to move to using the "btn-primary" class everywhere and eventually phase out the style applied to all kinds of input buttons.

Before:

<input type="submit" value="Search" />

After:

<input type="submit" class="btn btn-primary" value="Search" />