In episode 89 of Conversion Rate Optimization with Fexingo, Lucas and Luna dig into a real-world case: a mid-market e-commerce brand that saw its checkout completion rate stall at 61 percent for months. They tried everything — shorter forms, clearer CTAs, trust badges — but nothing moved the needle until a behavioral designer looked at the color palette. Lucas walks through how the team used color psychology principles (warm hues for urgency, cool tones for trust, high contrast for action elements) to redesign the checkout flow. The result? A 23 percent lift in completed purchases within two weeks. The conversation covers the science behind color associations, why A/B testing color changes is tricky (simultaneous contrast, cultural differences), and how the team validated their hypothesis with eye-tracking before running the test. If you've ever wondered whether button color really matters — spoiler: it does, but not in the way most people think — this episode gives you a framework, not a formula.