Sneaky Header Blocker Trick • Josh W. Comeau
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A CSS-only technique for creating a sticky header that appears to change background color as the user scrolls through different page sections. Instead of modifying the header itself, two color-matched 'blocker' elements using position:sticky sit behind the fixed header — one in the hero section (blue) and one in the main content area (white). As the user scrolls, each blocker naturally exits its container, creating a seamless hand-off effect. The post also covers design constraints, how to integrate decorative SVG swoops into the layering, and when JavaScript fallbacks are necessary.
Table of contents
Table of ContentsLink to this heading The core conceptLink to this heading Integrating swoopsLink to this heading Design requirementsLink to this heading All of the tricks up my sleeves95.2K Impressions2 Comments