The button group in Bootstrap does not support borders according to the design.However, in the implementation there are such borders which I assume are needed for consistency purposes coming from the rest of the themes. If we need to keep them for consistency purposes then they should be either transparent or with the same color as the background in each state, so that they are not visible.
Right now, there are states where the borders and the background are different colors and the borders are visible.
The button group in Bootstrap does not support borders according to the design.However, in the implementation there are such borders which I assume are needed for consistency purposes coming from the rest of the themes. If we need to keep them for consistency purposes then they should be either transparent or with the same color as the background in each state, so that they are not visible.
Right now, there are states where the borders and the background are different colors and the borders are visible.