Great news! 
Theme Inheritance for Dashboard Controls is launched. This is a new feature that automatically makes your dashboard filters and controls match your custom theme styling for a seamless, professional look.
What you will get: 
Automatic styling inheritance - Your dashboard control blocks now automatically adopt your theme’s Block Theme properties (background, border, text colors, etc.)
Consistent dashboard experience - No more mismatched controls that break your carefully designed theme aesthetic 
Zero extra work - It just works! Your existing custom themes now automatically apply to control blocks—no extra setup required.
Whether you’re building embedded analytics or internal reporting dashboards, your controls will soon seamlessly blend with your overall design vision 
The feature is currently available for Holistics 4.0.