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Flex

Utilities for controlling how flex items both grow and shrink

Class reference

ClassProperties
flex-initialflex: 0 1 auto;
flex-1flex: 1 1 0%;
flex-autoflex: 1 1 auto;
flex-noneflex: none;

Initial

Use .flex-initial to allow a flex item to shrink but not grow, taking into account its initial size:

Items don't grow when there's extra space

Short
Medium length

Items shrink if possible when needed

Short
Medium length
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<div class="flex">
  <div class="**flex-initial** ...">
    <!-- Won't grow, but will shrink if needed -->
  </div>
  <div class="**flex-initial** ...">
    <!-- Won't grow, but will shrink if needed -->
  </div>
  <div class="**flex-initial** ...">
    <!-- Won't grow, but will shrink if needed -->
  </div>
</div>

Flex 1

Use .flex-1 to allow a flex item to grow and shrink as needed, ignoring its initial size:

Default behavior

Short
Medium length
Significantly larger amount of content

With .flex-1

Short
Medium length
Significantly larger amount of content
<div class="flex">
  <div class="**flex-1** ...">
    <!-- Will grow and shrink as needed without taking initial size into account -->
  </div>
  <div class="**flex-1** ...">
    <!-- Will grow and shrink as needed without taking initial size into account -->
  </div>
  <div class="**flex-1** ...">
    <!-- Will grow and shrink as needed without taking initial size into account -->
  </div>
</div>

Auto

Use .flex-auto to allow a flex item to grow and shrink, taking into account its initial size:

Default behavior

Short
Medium length
Significantly larger amount of content

With .flex-auto

Short
Medium length
Significantly larger amount of content
<div class="flex ...">
  <div class="**flex-auto** ...">
    <!-- Will grow and shrink as needed taking initial size into account -->
  </div>
  <div class="**flex-auto** ...">
    <!-- Will grow and shrink as needed taking initial size into account -->
  </div>
  <div class="**flex-auto** ...">
    <!-- Will grow and shrink as needed taking initial size into account -->
  </div>
</div>

None

Use .flex-none to prevent a flex item from growing or shrinking:

Item that can grow or shrink if needed
Item that cannot grow or shrink
Item that can grow or shrink if needed
<div class="flex ...">
  <div class="flex-1 ...">
    <!-- Will grow and shrink as needed -->
  </div>
  <div class="**flex-none** ...">
    <!-- Will grow and shrink as needed taking initial size into account -->
  </div>
  <div class="flex-1 ...">
    <!-- Will grow and shrink as needed -->
  </div>
</div>

Responsive

To control how a flex item both grows and shrinks at a specific breakpoint, add a {screen}: prefix to any existing utility class. For example, use md:flex-1 to apply the flex-1 utility at only medium screen sizes and above.

<div class="flex ...">
  <!-- ... -->
  <div class="flex-none **md:flex-1** ...">
    Responsive flex item
  </div>
  <!-- ... -->
</div>

For more information about Elements’ responsive design features, check out the Responsive Design documentation.