flex.md 24 KB
layout: docs title: Flex description: Quickly manage the layout, alignment, and sizing of grid columns, navigation, components, and more with a full suite of responsive flexbox utilities. For more complex implementations, custom CSS may be necessary. group: utilities
toc: true
Enable flex behaviors
Apply display utilities to create a flexbox container and transform direct children elements into flex items. Flex containers and items are able to be modified further with additional flex properties.
{{< example >}}
{{< example >}}
Responsive variations also exist for .d-flex and .d-inline-flex.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.d{{ .abbr }}-flex.d{{ .abbr }}-inline-flex{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Direction
Set the direction of flex items in a flex container with direction utilities. In most cases you can omit the horizontal class here as the browser default is row. However, you may encounter situations where you needed to explicitly set this value (like responsive layouts).
Use .flex-row to set a horizontal direction (the browser default), or .flex-row-reverse to start the horizontal direction from the opposite side.
{{< example >}}
Use .flex-column to set a vertical direction, or .flex-column-reverse to start the vertical direction from the opposite side.
{{< example >}}
Responsive variations also exist for flex-direction.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.flex{{ .abbr }}-row.flex{{ .abbr }}-row-reverse.flex{{ .abbr }}-column.flex{{ .abbr }}-column-reverse{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Justify content
Use justify-content utilities on flexbox containers to change the alignment of flex items on the main axis (the x-axis to start, y-axis if flex-direction: column). Choose from start (browser default), end, center, between, around, or evenly.
<div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-end">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-between">...</div>
<div class="d-flex justify-content-around">...</div>
<div class="d-flex justify-content-evenly">...</div>
Responsive variations also exist for justify-content.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.justify-content{{ .abbr }}-start.justify-content{{ .abbr }}-end.justify-content{{ .abbr }}-center.justify-content{{ .abbr }}-between.justify-content{{ .abbr }}-around.justify-content{{ .abbr }}-evenly{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Align items
Use align-items utilities on flexbox containers to change the alignment of flex items on the cross axis (the y-axis to start, x-axis if flex-direction: column). Choose from start, end, center, baseline, or stretch (browser default).
<div class="d-flex align-items-start">...</div>
<div class="d-flex align-items-end">...</div>
<div class="d-flex align-items-center">...</div>
<div class="d-flex align-items-baseline">...</div>
<div class="d-flex align-items-stretch">...</div>
Responsive variations also exist for align-items.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.align-items{{ .abbr }}-start.align-items{{ .abbr }}-end.align-items{{ .abbr }}-center.align-items{{ .abbr }}-baseline.align-items{{ .abbr }}-stretch{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Align self
Use align-self utilities on flexbox items to individually change their alignment on the cross axis (the y-axis to start, x-axis if flex-direction: column). Choose from the same options as align-items: start, end, center, baseline, or stretch (browser default).
<div class="align-self-start">Aligned flex item</div>
<div class="align-self-end">Aligned flex item</div>
<div class="align-self-center">Aligned flex item</div>
<div class="align-self-baseline">Aligned flex item</div>
<div class="align-self-stretch">Aligned flex item</div>
Responsive variations also exist for align-self.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.align-self{{ .abbr }}-start.align-self{{ .abbr }}-end.align-self{{ .abbr }}-center.align-self{{ .abbr }}-baseline.align-self{{ .abbr }}-stretch{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Fill
Use the .flex-fill class on a series of sibling elements to force them into widths equal to their content (or equal widths if their content does not surpass their border-boxes) while taking up all available horizontal space.
{{< example >}}
Responsive variations also exist for flex-fill.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.flex{{ .abbr }}-fill{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Grow and shrink
Use .flex-grow-* utilities to toggle a flex item's ability to grow to fill available space. In the example below, the .flex-grow-1 elements uses all available space it can, while allowing the remaining two flex items their necessary space.
{{< example >}}
Use .flex-shrink-* utilities to toggle a flex item's ability to shrink if necessary. In the example below, the second flex item with .flex-shrink-1 is forced to wrap its contents to a new line, "shrinking" to allow more space for the previous flex item with .w-100.
{{< example >}}
Responsive variations also exist for flex-grow and flex-shrink.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.flex{{ .abbr }}-{grow|shrink}-0.flex{{ .abbr }}-{grow|shrink}-1{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Auto margins
Flexbox can do some pretty awesome things when you mix flex alignments with auto margins. Shown below are three examples of controlling flex items via auto margins: default (no auto margin), pushing two items to the right (.me-auto), and pushing two items to the left (.ms-auto).
{{< example >}}
<div class="d-flex flex-nowrap">
...
</div>
<div class="d-flex flex-wrap">
...
</div>
<div class="d-flex flex-wrap-reverse">
...
</div>
Responsive variations also exist for flex-wrap.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.flex{{ .abbr }}-nowrap.flex{{ .abbr }}-wrap.flex{{ .abbr }}-wrap-reverse{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Order
Change the visual order of specific flex items with a handful of order utilities. We only provide options for making an item first or last, as well as a reset to use the DOM order. As order takes any integer value from 0 to 5, add custom CSS for any additional values needed.
{{< example >}}
Responsive variations also exist for order.
{{< markdown >}} {{< flex.inline >}} {{- range $bp := $.Site.Data.breakpoints -}} {{- range (seq 0 5) }}
.order{{ $bp.abbr }}-{{ . }}{{- end -}} {{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Additionally there are also responsive .order-first and .order-last classes that change the order of an element by applying order: -1 and order: 6, respectively.
{{< markdown >}} {{< flex.inline >}} {{- range $bp := $.Site.Data.breakpoints -}} {{- range (slice "first" "last") }}
.order{{ $bp.abbr }}-{{ . }}{{- end -}} {{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Align content
Use align-content utilities on flexbox containers to align flex items together on the cross axis. Choose from start (browser default), end, center, between, around, or stretch. To demonstrate these utilities, we've enforced flex-wrap: wrap and increased the number of flex items.
Heads up! This property has no effect on single rows of flex items.
<div class="d-flex align-content-start flex-wrap">
...
</div>
<div class="d-flex align-content-end flex-wrap">...</div>
<div class="d-flex align-content-center flex-wrap">...</div>
<div class="d-flex align-content-between flex-wrap">...</div>
<div class="d-flex align-content-around flex-wrap">...</div>
<div class="d-flex align-content-stretch flex-wrap">...</div>
Responsive variations also exist for align-content.
{{< markdown >}} {{< flex.inline >}} {{- range $.Site.Data.breakpoints }}
.align-content{{ .abbr }}-start.align-content{{ .abbr }}-end.align-content{{ .abbr }}-center.align-content{{ .abbr }}-around.align-content{{ .abbr }}-stretch{{- end -}} {{< /flex.inline >}} {{< /markdown >}}
Media object
Looking to replicate the media object component from Bootstrap 4? Recreate it in no time with a few flex utilities that allow even more flexibility and customization than before.
{{< example >}}
{{< placeholder width="100" height="100" color="#999" background="#e5e5e5" text="Image" >}}
This is some content from a media component. You can replace this with any content and adjust it as needed.
And say you want to vertically center the content next to the image:
{{< example >}}
{{< placeholder width="100" height="100" color="#999" background="#e5e5e5" text="Image" >}}
This is some content from a media component. You can replace this with any content and adjust it as needed.
Sass
Utilities API
Flexbox utilities are declared in our utilities API in scss/_utilities.scss. Learn how to use the utilities API.
{{< scss-docs name="utils-flex" file="scss/_utilities.scss" >}}