23 KiB
| layout | title | description | group | toc |
|---|---|---|---|---|
| docs | Flex | 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. | utilities | 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.
{% capture example %}
{% capture example %}
Responsive variations also exist for .d-flex and .d-inline-flex.
{% for bp in site.data.breakpoints %}
.d{{ bp.abbr }}-flex.d{{ bp.abbr }}-inline-flex{% endfor %}
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.
{% capture example %}
Use .flex-column to set a vertical direction, or .flex-column-reverse to start the vertical direction from the opposite side.
{% capture example %}
Responsive variations also exist for flex-direction.
{% for bp in site.data.breakpoints %}
.flex{{ bp.abbr }}-row.flex{{ bp.abbr }}-row-reverse.flex{{ bp.abbr }}-column.flex{{ bp.abbr }}-column-reverse{% endfor %}
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, or around.
{% highlight html %}
Responsive variations also exist for justify-content.
{% for bp in site.data.breakpoints %}
.justify-content{{ bp.abbr }}-start.justify-content{{ bp.abbr }}-end.justify-content{{ bp.abbr }}-center.justify-content{{ bp.abbr }}-between.justify-content{{ bp.abbr }}-around{% endfor %}
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).
{% highlight html %}
Responsive variations also exist for align-items.
{% for bp in site.data.breakpoints %}
.align-items{{ bp.abbr }}-start.align-items{{ bp.abbr }}-end.align-items{{ bp.abbr }}-center.align-items{{ bp.abbr }}-baseline.align-items{{ bp.abbr }}-stretch{% endfor %}
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).
{% highlight html %}
Responsive variations also exist for align-self.
{% for bp in site.data.breakpoints %}
.align-self{{ bp.abbr }}-start.align-self{{ bp.abbr }}-end.align-self{{ bp.abbr }}-center.align-self{{ bp.abbr }}-baseline.align-self{{ bp.abbr }}-stretch{% endfor %}
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.
{% capture example %}
Responsive variations also exist for flex-fill.
{% for bp in site.data.breakpoints %}
.flex{{ bp.abbr }}-fill{% endfor %}
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.
{% capture 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.
{% capture example %}
Responsive variations also exist for flex-grow and flex-shrink.
{% for bp in site.data.breakpoints %}
.flex{{ bp.abbr }}-{grow|shrink}-0.flex{{ bp.abbr }}-{grow|shrink}-1{% endfor %}
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 (.mr-auto), and pushing two items to the left (.ml-auto).
Unfortunately, IE10 and IE11 do not properly support auto margins on flex items whose parent has a non-default justify-content value. See this StackOverflow answer for more details.
{% capture example %}
With align-items
Vertically move one flex item to the top or bottom of a container by mixing align-items, flex-direction: column, and margin-top: auto or margin-bottom: auto.
{% capture example %}
Wrap
Change how flex items wrap in a flex container. Choose from no wrapping at all (the browser default) with .flex-nowrap, wrapping with .flex-wrap, or reverse wrapping with .flex-wrap-reverse.
{% highlight html %}
{% highlight html %}
{% highlight html %}
Responsive variations also exist for flex-wrap.
{% for bp in site.data.breakpoints %}
.flex{{ bp.abbr }}-nowrap.flex{{ bp.abbr }}-wrap.flex{{ bp.abbr }}-wrap-reverse{% endfor %}
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 (e.g., 5), add custom CSS for any additional values needed.
{% capture example %}
Responsive variations also exist for order.
{% for bp in site.data.breakpoints %}{% for i in (0..12) %}
.order{{ bp.abbr }}-{{ i }}{% endfor %}{% endfor %}
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.
{% highlight html %}
{% highlight html %}
{% highlight html %}
{% highlight html %}
{% highlight html %}
{% highlight html %}
Responsive variations also exist for align-content.
{% for bp in site.data.breakpoints %}
.align-content{{ bp.abbr }}-start.align-content{{ bp.abbr }}-end.align-content{{ bp.abbr }}-center.align-content{{ bp.abbr }}-around.align-content{{ bp.abbr }}-stretch{% endfor %}