A less mixin for flexbox.

The mixin names and their values correspond to the official draft.

• display
• justify-content
• align-items
• align-self
• align-content
• order
• flex
• flex-grow
• flex-shrink
• flex-basis
• flex-direction
• flex-wrap
• flex-flow

In Firefox < 22 you need to add the following snippet to every element that you set display: flex.

/*
 * Legacy Firefox implementation treats all flex containers
 * as inline-block elements.
 */
@-moz-document url-prefix() {
    #selector {
        width: 100%;
        -moz-box-sizing: border-box;
    }
}

• Official W3C Editor's Draft
• Centering Elements with Flexbox from Smashing Magazine