CSS gap: The Ultimate Guide to Spacing Flexbox and Grid Items (No More Margins!)

The CSS gap property provides a clean solution for spacing items in Grid and Flexbox layouts without margin hacks. Originally designed for CSS Grid, gap is now fully supported in Flexbox, allowing developers to apply spacing between elements at the container level using gap, row-gap, and column-gap properties. The guide covers syntax, practical examples for both layout systems, handling wrapped flex items, and explains how gap eliminates the need for negative margins and :not(:last-child) selectors while ensuring spacing never extends beyond container edges.