Hello JP,
Sorry for the problem with the color in the Call to Action section. Currently, there is no way to change that particular short of custom programming for the transition to the smaller sizes. The text color for the theme is specifically set for the default font color due to the responsive issues for the theme. At this time, there is no way to make the change in the default functions of BoldGrid.
If you have any further questions or comments, please let us know.
Regards,
Arnel C.