UIkit 3.x Documentation (as of v3.15.0)

Background

A collection of utility classes to add different backgrounds to elements.

# Usage

To apply a background color to an element, add one of the following classes. The actual color for each modifier is defined by the UIkit style that you have chosen or customized.

Class Description
.uk-background-default Applies the default background color.
.uk-background-muted Applies a muted background color.
.uk-background-primary Applies the primary background color.
.uk-background-secondary Applies a secondary background color.
<div class="uk-background-primary"></div>

Note To adapt your content for better visibility on each background, add the .uk-light or .uk-dark class from the Inverse component. Use the Padding component to add some padding to the elements.

<div class="uk-child-width-1-2@s uk-text-center" uk-grid>
    <div>
        <div class="uk-background-default uk-padding uk-panel">
            <p class="uk-h4">Default</p>
        </div>
    </div>
    <div>
        <div class="uk-background-muted uk-padding uk-panel">
            <p class="uk-h4">Muted</p>
        </div>
    </div>
    <div>
        <div class="uk-background-primary uk-light uk-padding uk-panel">
            <p class="uk-h4">Primary</p>
        </div>
    </div>
    <div>
        <div class="uk-background-secondary uk-light uk-padding uk-panel">
            <p class="uk-h4">Secondary</p>
        </div>
    </div>
</div>

# Size modifiers

This component features classes to specify the size of background images by keeping its intrinsic ratio.

Class Description
.uk-background-cover Scales the background image to completely cover the containing area.
.uk-background-contain Scales the background image as far as its width and height can fit inside the containing area.
.uk-background-width-1-1 Scales the background image to fill 100% of the available width.
.uk-background-height-1-1 Scales the background image to fill 100% of the available height.

Note When using these classes, the background position automatically shifts to the middle and background-repeat is set to no-repeat.

<div class="uk-background-cover"></div>

<div class="uk-child-width-1-2@s uk-light" uk-grid>
    <div>
        <div class="uk-background-cover uk-height-medium uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/dark.jpg);">
            <p class="uk-h4">Cover</p>
        </div>
    </div>
    <div>
        <div class="uk-background-contain uk-background-muted uk-height-medium uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/dark.jpg);">
            <p class="uk-h4">Contain</p>
        </div>
    </div>
</div>

# Position modifiers

To alter the background position of your image — which is in the top left-hand corner of the area by default, add one of the following classes.

Class Description
.uk-background-top-left The initial position of the image is in the top left hand corner.
.uk-background-top-center The initial position of the image is at the top.
.uk-background-top-right The initial position of the image is in the top right hand corner.
.uk-background-center-left The initial position of the image is on the left.
.uk-background-center-center The initial position of the image is in the middle.
.uk-background-center-right The initial position of the image is on the right.
.uk-background-bottom-left The initial position of the image is in the bottom left hand corner.
.uk-background-bottom-center The initial position of the image is at the bottom.
.uk-background-bottom-right The initial position of the image is in the bottom right hand corner.
<div class="uk-background-top-left"></div>

<div class="uk-child-width-1-2@s uk-light" uk-grid>
    <div>
        <div class="uk-background-top-right uk-background-cover uk-height-medium uk-panel uk-flex uk-flex-middle uk-flex-center" style="background-image: url(images/dark.jpg);">
            <p class="uk-h4">Top Right</p>
        </div>
    </div>
    <div>
        <div class="uk-background-top-left uk-background-cover uk-height-medium uk-panel uk-flex uk-flex-middle uk-flex-center" style="background-image: url(images/dark.jpg);">
            <p class="uk-h4">Top Left</p>
        </div>
    </div>
</div>

# No repeat

To keep smaller images from repeating to fill the background area, add the .uk-background-norepeat class.

<div class="uk-background-norepeat"></div>

# Attachment

You can also apply a fixed background attachment, so that the image remains in its position while scrolling the site.

<div class="uk-background-fixed"></div>

<div class="uk-background-fixed uk-background-center-center uk-height-medium uk-width-large" style="background-image: url(images/dark.jpg);"></div>

# Responsive

Add one of the following classes to limit the display of background images to certain viewport sizes. This is great in cases where the image and content overlap on a phone screen in a way that would make text illegible.

Class Description
.uk-background-image@s Displays the background image on device widths of 640px and larger.
.uk-background-image@m Displays the background image on device widths of 960px and larger.
.uk-background-image@l Displays the background image on device widths of 1200px and larger.
.uk-background-image@xl Displays the background image on device widths of 1600px and larger.
<div class="uk-background-image@m"></div>

Resize your browser window to see the effect in the example below.

<div class="uk-background-image@m uk-background-cover uk-background-muted uk-height-medium uk-width-large uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/dark.jpg);">
    <p class="uk-h4 uk-margin-remove uk-visible@m uk-light">Image shown</p>
    <p class="uk-h4 uk-margin-remove uk-hidden@m">Image not shown</p>
</div>

# Blend modes

Add one of the following classes to apply different blend modes to your background image. You can combine these with the background color classes, as well. For a better understanding of how background blend modes work, take a look at this CSS Tricks article (opens new window).

Class Description
.uk-background-blend-multiply This class sets the blend mode to multiply.
.uk-background-blend-screen This class sets the blend mode to screen.
.uk-background-blend-overlay This class sets the blend mode to overlay.
.uk-background-blend-darken This class sets the blend mode to darken.
.uk-background-blend-lighten This class sets the blend mode to lighten.
.uk-background-blend-color-dodge This class sets the blend mode to color dodge.
.uk-background-blend-color-burn This class sets the blend mode to color burn.
.uk-background-blend-hard-light This class sets the blend mode to hard light.
.uk-background-blend-soft-light This class sets the blend mode to soft light.
.uk-background-blend-difference This class sets the blend mode to difference.
.uk-background-blend-exclusion This class sets the blend mode to exclusion.
.uk-background-blend-hue This class sets the blend mode to hue.
.uk-background-blend-saturation This class sets the blend mode to saturation.
.uk-background-blend-color This class sets the blend mode to color.
.uk-background-blend-luminosity This class sets the blend mode to luminosity.
<div class="uk-background-blend-multiply uk-background-primary"></div>

<div class="uk-child-width-1-2 uk-child-width-1-3@s uk-grid-small uk-light" uk-grid>
    <div>
        <div class="uk-background-blend-multiply uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Multiply</p>
       </div>
    </div>
    <div>
        <div class="uk-background-blend-screen uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Screen</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-overlay uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Overlay</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-darken uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Darken</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-lighten uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Lighten</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-color-dodge uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Color Dodge</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-color-burn uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Color Burn</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-hard-light uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Hard Light</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-soft-light uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Soft Light</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-difference uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Difference</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-exclusion uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Exclusion</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-hue uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Hue</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-saturation uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Saturation</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-color uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Color</p>
        </div>
    </div>
    <div>
        <div class="uk-background-blend-luminosity uk-background-primary uk-background-cover uk-height-small uk-panel uk-flex uk-flex-center uk-flex-middle" style="background-image: url(images/photo.jpg);">
            <p class="uk-h4">Luminosity</p>
        </div>
    </div>
</div>

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