Ability to add own classed to export buttons

[Mashiane]

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Is your feature request related to a problem? Please describe. I like the bootstrap theme on the buttons. I would however like to add my own defined classes to the buttons to change the forecolor / backcolor of the buttons.

Describe the solution you'd like Ability to specify additional classes for export buttons, for example, have different colors for buttons.

Describe alternatives you've considered Tried to change the button config, not applying.