Mastering GSAP Interactions in Webflow: Persistent Light/Dark Mode Toggle

In this lesson, we build a complete and persistent light/dark mode switch from scratch. But this isn’t just about toggling colors. We start by structuring a proper Variable-based color system, defining a dedicated Dark Mode as a manual Variable Mode, and connecting every relevant color property across the project to that system. Then we build the toggle itself using Webflow’s new GSAP-powered interaction system, leveraging the Set action to manage theme state through classes instead of directly animating properties. To improve the visual experience, we introduce a controlled transition system that ensures smooth color shifts without interfering with hover, scroll, or other animations. Finally, we add a small layer of JavaScript to: ✅ Persist the user’s theme preference using localStorage ✅ Respect the user’s system color preference (prefers-color-scheme) ✅ Prevent flickering by applying the correct theme before the page renders 👉 Watch on YouTube: https://youtu.be/WI--cOr72u0