flex basis

Utilities for controlling the initial size of flex items.

2025-03-05

Written by: tdtc

Class	Styles
`basis-<number>`	`flex-basis: calc(var(--spacing) * <number>);`
`basis-<fraction>`	`flex-basis: calc(<fraction> * 100%);`
basis-full	flex-basis: 100%;
basis-auto	flex-basis: auto;
basis-3xs	flex-basis: var(—container-3xs); /* 16rem (256px) */
basis-2xs	flex-basis: var(—container-2xs); /* 18rem (288px) */
basis-xs	flex-basis: var(—container-xs); /* 20rem (320px) */
basis-sm	flex-basis: var(—container-sm); /* 24rem (384px) */
basis-md	flex-basis: var(—container-md); /* 28rem (448px) */
basis-lg	flex-basis: var(—container-lg); /* 32rem (512px) */
basis-xl	flex-basis: var(—container-xl); /* 36rem (576px) */
basis-2xl	flex-basis: var(—container-2xl); /* 42rem (672px) */
basis-3xl	flex-basis: var(—container-3xl); /* 48rem (768px) */
basis-4xl	flex-basis: var(—container-4xl); /* 56rem (896px) */
basis-5xl	flex-basis: var(—container-5xl); /* 64rem (1024px) */
basis-6xl	flex-basis: var(—container-6xl); /* 72rem (1152px) */
basis-7xl	flex-basis: var(—container-7xl); /* 80rem (1280px) */
`basis-(<custom-property>)`	`flex-basis: var(<custom-property>);`
`basis-[<value>]`	`flex-basis: <value>;`

flex-basis

Using the spacing scale
Using the container scale
Using percentages
Using a custom value

Using the spacing scale

Use basis- utilities like basis-64 and basis-128 to set the initial size of flex items based on the spacing scale:

<div class="flex flex-row">
  <div class="basis-64">01</div>
  <div class="basis-64">02</div>
  <div class="basis-128">03</div>
</div>

Using the container scale

Use utilities like basis-xs and basis-sm to set the initial size of flex items based on the container scale:

<div class="flex flex-row">
  <div class="basis-3xs">01</div>
  <div class="basis-2xs">02</div>
  <div class="basis-xs">03</div>
  <div class="basis-sm">04</div>
</div>

Using percentages

Use basis- utilities like basis-1/2 and basis-2/3 to set the initial size of flex items:

<div class="flex flex-row">
  <div class="basis-1/3">01</div>
  <div class="basis-2/3">02</div>
</div>

Using a custom value

Use the basis-[] syntax to set the basis based on a completely custom value: