Advanced Diagnostics

You wrote position: sticky; top: 0;, but nothing happens? Let's break down the most common " breakage " causes.

1. Overflow Trap

This is the most common cause (99% of cases). If ANY parent (even 5 levels up) has overflow: hidden / auto / scroll, stickiness breaks.

• How to check: Go through all parents in DevTools and temporarily disable overflow.

2. Height Problem

A sticky block only " sticks " while it's inside its parent. If the parent has the same height as the block itself — there's nowhere to stick.

• Solution: Ensure the container (section or sidebar) is taller than the sticky element.

3. Parent Display Property

If the parent is a Flex container, it by default stretches children to full height (align-items: stretch). The sticky block will stretch and get " stuck " in place.

• Solution: Add align-self: flex-start to the sticky block.