Implementing Dynamic Colour Palettes in Drupal Themes Using CSS Variables

Staff Reporter

assorted color holi powder lot — Ronni Kurtz / Unsplash

In a blog post shared by Morpht, Naveen Valecha introduces a modern approach to managing theme colours in Drupal using CSS Variables. The post explains how the convivial_govcms_bootstrap theme moves away from static SASS-based theming—which requires recompilation for each change—and instead enables real-time colour adjustments. This shift benefits branding consistency, accessibility, and ease of use. Site builders can define colour palettes, preview changes instantly, and ensure WCAG-compliant contrast levels without writing code.

The implementation uses Drupal hooks, JavaScript, and CSS to create a no-code interface for selecting and applying theme colours. Key steps include integrating colour settings into the theme configuration form using hook_form_system_theme_settings_alter() injecting CSS variables via hook_page_attachments_alter(), and dynamically processing colour relationships with JavaScript. Support for light/dark themes and UI variations ensures flexibility across elements like buttons, backgrounds, and text.

Source Reference

Title

Enhancing Your Theme with Dynamic Colour Palettes

Byline

Naveen Valecha

Date of Publication

26 March 2025

Organization

Morpht

Drupal

Drupal Theming

CSS

Theme

Drupal 10

Morpht

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