flex-grow

Defines the ability for a flex item to grow if necessary. It accepts a unitless value that serves as a proportion; it dictates how much of the available space inside the flex container the item should take up.

It is documented as part of the CSS Flexible Box Layout specification.

/* Usage Example */
.sidebar { flex-grow: 0; } /* stays fixed width */
.main-content{ flex-grow: 1; } /* grows to fill all remaining space */

/* Global values */
flex-grow: inherit;
flex-grow: initial;
flex-grow: revert;
flex-grow: revert-layer;
flex-grow: unset;
Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

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