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Flex

Flex utilities control flexbox layouts: direction, wrapping, alignment on both axes, growing, shrinking, order and gaps. Every utility has responsive variants such as flex-md-row or justify-content-lg-between, so one set of markup can stack on phones and spread out on larger screens.

1Direction

flex-row is the default, flex-row-reverse flips it, flex-column stacks items.

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2Justify content

start, center, end, between, around and evenly distribute free space on the main axis.

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3Align items

align-items-start, -center, -end and -stretch align items on the cross axis.

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4Align self

align-self-* moves a single item on the cross axis.

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5Fill and grow

flex-fill shares space equally, flex-grow-1 takes the remaining space.

flex-fill
flex-fill wider text
fill
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flex-grow-1
auto

6Shrink

flex-shrink-0 keeps an item at its size while the other one shrinks.

flex-shrink-0
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7Auto margins

ms-auto pushes an item and everything after it to the end.

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8Wrap

flex-wrap lets items move to a new line; flex-nowrap keeps one line.

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9Order

order-* changes the visual order without changing the markup.

first in markup, order-3
second, order-1
third, order-2

10Row gap and column gap

row-gap-* and column-gap-* set the two gaps separately.

row-gap-4
column-gap-1
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11Responsive direction

flex-column flex-sm-row: a sign-up form stacks on phones and sits in one row from sm.

12Media list

Each row is d-flex with an icon box that never shrinks.

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13Sticky footer in a card

A flex-column card with flex-grow-1 body keeps the button at the bottom regardless of text length.

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14Align content

align-content-* distributes wrapped lines in a taller container.

align-content-between
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15Baseline alignment

align-items-baseline lines up text of different sizes on its baseline.

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16Horizontal stack

hstack is a shortcut for a centred flex row with gap.

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17Vertical stack

vstack is a flex column with gap: quick form or card layouts.

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18Responsive justify

justify-content-center justify-content-md-between centres on phones and spreads from md.

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19Equal width columns with flex-fill

Navigation tabs share the row equally with flex-fill and text-center.

20Reverse on large screens

flex-column flex-lg-row-reverse: on large screens the image moves to the right.

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