Button - Bootstrap Theme - When theme is applied, button does not look like a bootstrap button

[brianlagunas]

Description

When the bootstrap theme is applied, the button component does not look like a bootstrap button.

Here is what the bootstrap buttons look like depending on which button style (primary, secondary, success, etc) they use:

Here is what the igc-button looks like when the bootstrap theme is applied

Steps to reproduce

1. Run story board
2. Apply bootstrap theme
3. Observe the button

Result

The button looks nothing like a bootstrap button

Expected result

The button needs to look like a bootstrap button when the bootstrap theme is applied