Hi,
The two CTA buttons are designed to inherit colors from other configuration options and don’t have their distinct options. If needed, you can customize the buttons with CSS:
body a.staticslider-button:first-child,
body .seriousslider-theme .seriousslider-caption-buttons a.seriousslider-button:first-child {
color: white;
border-color: white;
}
This only applies to the first button – adjust the color (and add additional styling) as necessary.