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The align-content property is a sub-property of the Flexible Box Layout module.

It helps aligning a flex container's lines within it when there is extra space in the cross-axis, similar to how justify-content aligns individual items within the main-axis.

Note, this property has no effect when the flexbox has only a single line.

The align-content property accepts 6 different values:

  • flex-start: lines packed to the start of the container
  • flex-end: lines packed to the end of the container
  • center: lines packed to the center of the container
  • space-between: lines evenly distributed; the first line is at the start of the container while the last one is at the end
  • space-around: lines evenly distributed with equal space between them
  • stretch (default): lines stretch to take up the remaining space

The following figure helps understand how the lines are stacked up in a flex container depending on the align-content value:



align-content: flex-start | flex-end | center | space-between | space-around | stretch

.flex-container {
  align-content: space-around;


The following demo shows how lines are stacked out depending on the `align-content` value:

  • The red list is set to flex-start
  • The yellow list is set to flex-end
  • The blue list is set to center
  • The green list is set to space-between
  • The pink list is set to space-around
  • The brown list is set to stretch
Check out this Pen!

Related Properties

Other Resources

Browser Support

  • (modern) means the recent syntax from the specification (e.g. display: flex;)
  • (hybrid) means an odd unofficial syntax from 2011 (e.g. display: flexbox;)
  • (old) means the old syntax from 2009 (e.g. display: box;)
Chrome Safari Firefox Opera IE Android iOS
21+ (modern)
20- (old)
3.1+ (old) 2-21 (old)
22+ (new)
12.1+ (modern) 10+ (hybrid) 2.1+ (old) 3.2+ (old)

Blackberry browser 10+ supports the new syntax.

For more informations about how to mix syntaxes in order to get the best browser support, please refer to this article (CSS-Tricks) or this article (DevOpera).


  1. Nadav
    Permalink to comment#

    I’m viewing this page on firefox 22.0 and the demo does not work.

  2. Yogesh

    It is not working on firefox 29.0

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