Bootstrap helpers

MDB includes dozens of utilities—classes with a single purpose. They’re designed to reduce the frequency of highly repetitive declarations in your CSS while allowing for quick and easy development.

Responsive utilities

For faster mobile-friendly development, use these utility classes for showing and hiding content by device via media query. Also included are utility classes for toggling content when printed.

Try to use these on a limited basis and avoid creating entirely different versions of the same site. Instead, use them to complement each device’s presentation.

1. The .hidden-*-up classes hide the element when the viewport is at the given breakpoint or wider. For example, .hidden-md-up hides an element on medium, large, and extra-large viewports.
2. The .hidden-*-down classes hide the element when the viewport is at the given breakpoint or smaller. For example, .hidden-md-down hides an element on extra-small, small, and medium viewports).
3. There are no explicit “visible”/”show” responsive utility classes; you make an element visible by simply not hiding it at that breakpoint size.
4. You can combine one .hidden-*-up class with one .hidden-*-down class to show an element only on a given interval of screen sizes. For example, .hidden-sm-down.hidden-xl-up shows the element only on medium and large viewports. Using multiple .hidden-*-up classes or multiple .hidden-*-down classes is redundant and pointless.
5. These classes don’t attempt to accommodate less common cases where an element’s visibility can’t be expressed as a single contiguous range of viewport breakpoint sizes; you will instead need to use custom CSS in such cases.

Spacing

Assign responsive-friendly margin or padding values to an element or a subset of its sides with shorthand classes. Includes support for individual properties, all properties, and vertical and horizontal properties. Classes are built from a default Sass map ranging from .25rem to 3rem.

Spacing utilities that apply to all breakpoints, from xs to xl, have no breakpoint abbreviation in them. This is because those classes are applied from min-width: 0 and up, and thus are not bound by a media query. The remaining breakpoints, however, do include a breakpoint abbreviation.

The classes are named using the format {property}{sides}-{size} for xs and {property}{sides}-{breakpoint}-{size} for sm, md, lg, and xl.

Where property is one of:

• m - for classes that set margin
• p - for classes that set padding

Where sides is one of:

• t - for classes that set margin-top or padding-top
• b - for classes that set margin-bottom or padding-bottom
• l - for classes that set margin-left or padding-left
• r - for classes that set margin-right or padding-right
• x - for classes that set both *-left and *-right
• y - for classes that set both *-top and *-bottom
• blank - for classes that set a margin or padding on all 4 sides of the element

Where size is one of:

• 0 - for classes that eliminate the margin or padding by setting it to 0
• 1 - (by default) for classes that set the margin or padding to $spacer-x * .25 or $spacer-y * .25
• 2 - (by default) for classes that set the margin or padding to $spacer-x * .5 or $spacer-y * .5
• 3 - (by default) for classes that set the margin or padding to $spacer-x or $spacer-y
• 4 - (by default) for classes that set the margin or padding to $spacer-x * 1.5 or $spacer-y * 1.5
• 5 - (by default) for classes that set the margin or padding to $spacer-x * 3 or $spacer-y * 3

(You can add more sizes by adding entries to the $spacers Sass map variable.)

.mt-0 {
  margin-top: 0 !important;
}

.ml-1 {
  margin-left: ($spacer-x * .25) !important;
}

.px-2 {
  padding-left: ($spacer-x * .5) !important;
  padding-right: ($spacer-x * .5) !important;
}

.p-3 {
  padding: $spacer-y $spacer-x !important;
}

Horizontal centering

Here are some representative examples of these classes:

<div class="mx-auto" style="width: 200px;">
  Centered element
</div>

Text alignment

Easily realign text to components with text alignment classes.

Justified text

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Recusandae magni ratione autem velit quod aliquid odit, ipsam praesentium cum. Itaque laudantium inventore sapiente consequatur blanditiis tenetur eos libero quaerat repellat.

<p class="text-justify">Justified text.</p>

For the left, right, and center alignment, responsive classes are available that use the same viewport width breakpoints as the grid system.

<p class="text-left">Left aligned text on all viewport sizes.</p>
<p class="text-center">Center aligned text on all viewport sizes.</p>
<p class="text-right">Right aligned text on all viewport sizes.</p>

<p class="text-sm-left">Left aligned text on viewports sized SM (small) or wider.</p>
<p class="text-md-left">Left aligned text on viewports sized MD (medium) or wider.</p>
<p class="text-lg-left">Left aligned text on viewports sized LG (large) or wider.</p>
<p class="text-xl-left">Left aligned text on viewports sized XL (extra-large) or wider.</p>

Text transform

Transform text in components with text capitalization classes.

<p class="text-lowercase">Lowercased text.</p>
<p class="text-uppercase">Uppercased text.</p>
<p class="text-capitalize">CapiTaliZed text.</p>

Font weight and italics

Quickly change the weight (boldness) of text or italicize text.

<p class="font-weight-bold">Bold text.</p>
<p class="font-weight-normal">Normal weight text.</p>
<p class="font-italic">Italicized text.</p>

Contextual colors and backgrounds

Convey meaning through color with a handful of emphasis utility classes. These may also be applied to links and will darken on hover just like our default link styles.

Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.

Nullam id dolor id nibh ultricies vehicula ut id elit.

Duis mollis, est non commodo luctus, nisi erat porttitor ligula.

Maecenas sed diam eget risus varius blandit sit amet non magna.

Etiam porta sem malesuada magna mollis euismod.

Donec ullamcorper nulla non metus auctor fringilla.

<p class="text-muted">Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.</p>
<p class="text-primary">Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
<p class="text-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</p>
<p class="text-info">Maecenas sed diam eget risus varius blandit sit amet non magna.</p>
<p class="text-warning">Etiam porta sem malesuada magna mollis euismod.</p>
<p class="text-danger">Donec ullamcorper nulla non metus auctor fringilla.</p>

Contextual text classes also work well on anchors with the provided hover and focus states.

<a href="#" class="text-muted">Muted link</a>
<a href="#" class="text-primary">Primary link</a>
<a href="#" class="text-success">Success link</a>
<a href="#" class="text-info">Info link</a>
<a href="#" class="text-warning">Warning link</a>
<a href="#" class="text-danger">Danger link</a>

Similar to the contextual text color classes, easily set the background of an element to any contextual class. Anchor components will darken on hover, just like the text classes. Background utilities do not set color, so in some cases, you’ll want to use .text-* utilities.

<div class="bg-primary text-white">Nullam id dolor id nibh ultricies vehicula ut id elit.</div>
<div class="bg-success text-white">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</div>
<div class="bg-info text-white">Maecenas sed diam eget risus varius blandit sit amet non magna.</div>
<div class="bg-warning text-white">Etiam porta sem malesuada magna mollis euismod.</div>
<div class="bg-danger text-white">Donec ullamcorper nulla non metus auctor fringilla.</div>
<div class="bg-inverse text-white">Cras mattis consectetur purus sit amet fermentum.</div>

Close icon

Use a generic close icon for dismissing content like modals and alerts. Be sure to include text for screen readers, as we’ve done with aria-label.

<button type="button" class="close" aria-label="Close">
  <span aria-hidden="true">&times;</span>
</button>

Responsive floats

These utility classes float an element to the left or right or disable floating, based on the current viewport size using the CSS float property. !important is included to avoid specificity issues. These use the same viewport width breakpoints as the grid system.

<div class="float-left">Float left on all viewport sizes</div>
<div class="float-right">Float right on all viewport sizes</div>
<div class="float-none">Don't float on all viewport sizes</div>

<div class="float-sm-left">Float left on viewports sized SM (small) or wider</div>
<div class="float-md-left">Float left on viewports sized MD (medium) or wider</div>
<div class="float-lg-left">Float left on viewports sized LG (large) or wider</div>
<div class="float-xl-left">Float left on viewports sized XL (extra-large) or wider</div>

Center content

To center content vertically and horizontally, add class .flex-center to the parent element.

Note: You have to define the height of the parent element. You can use either relative units (like %, em or rem) or absolute (like px).

.example-parent {
    height: 300px;
}

<div class="example-parent flex-center">
    <div>Centered content</div>
</div>

Vertical alignment

Change the alignment of elements with the vertical-alignment utilities. Please note that vertical-align only affects inline, inline-block, inline-table, and table cell elements.

Choose from .align-baseline, .align-top, .align-middle, .align-bottom, .align-text-bottom, and .align-text-top as needed.

With inline elements:

<span class="align-baseline">baseline</span>
<span class="align-top">top</span>
<span class="align-middle">middle</span>
<span class="align-bottom">bottom</span>
<span class="align-text-top">text-top</span>
<span class="align-text-bottom">text-bottom</span>

With table cells:

<table style="height: 100px;">
  <tbody>
    <tr>
      <td class="align-baseline">baseline</td>
      <td class="align-top">top</td>
      <td class="align-middle">middle</td>
      <td class="align-bottom">bottom</td>
      <td class="align-text-top">text-top</td>
      <td class="align-text-bottom">text-bottom</td>
    </tr>
  </tbody>
</table>