Flex-Cheat — Easy Cheat Classes for Varied CSS Layouts Using Flexboxes

Flex-Cheat is thirty lines of CSS, exposed as six classes, which can be mixed and matched to produce pretty much any HTML element layout using the magic of flexboxes.

In a recent post on HackerNews, a lot of commentators lamented the difficulty of laying out HTML elements using CSS. I used to find laying elements out in HTML using CSS quite annoying and tedious too — until flexbox came along, and made life a lot easier, at least when it comes to layouts.

For the past few years, I’ve used the same six custom classes and their associated CSS style declarations, as a layout helper for my applications. By mixing and matching these classes, I’ve been able to generate pretty much any layout I’ve wanted to, with minimal pain.


The flex-cheat utility declares the following styles:

  • flex-container: Marks an item as a display:flex and all it's immediate children as fixed width i.e. both flex-grow and flex-shrink set to 0.
  • flex-container.column: flex-container + sets flex-direction to column.
  • flex-container.inline: flex-container but sets display to flex-inline instead of flex.
  • flex-container.center: flex-container + centers direct child elements using align-items.
  • flex-container.column.center: flex-container.column + centers direct child elements using justify-content.
  • flex-rest: To be added to specific direct child elements, to allow them to take up the rest of available space. When multiple child elements are marked as flex-rest they share remaining space equally. Components marked flex-rest will grow and shrink as required.

The flex-cheat CSS utility, is basically my little magic wand, and waving it just the right way, gives me the exact layout I want. To demonstrate my point, I’m going to show a few different layouts that were generated using only the six flex-cheat classes.

  • Fixed Width Row:
  • Equal Width Row:
  • Mixed Width Row:
  • Centered With Fixed Width Row:
  • Centered With Mixed Width Row:
  • Fixed Height Column:
  • Equal Height Column:
  • Mixed Height Column:
  • Centered With Fixed Height Column:
  • Centered With Mixed Height Column:
  • Grid With Mixed Rows and Columns:

The HackerNews post, triggered me to clean up the flex-cheat CSS and open source it. You can checkout the flex-cheat CSS utility on Github. Usage examples are available in the examples directory.

I’d love to hear your opinion on things I’ve written in this article, so do chime in with your comments below.


Originally published at asleepysamurai.com on January 29, 2019.