Blur background image with css

How to apply a CSS filter to a background image

I have a JPEG file that I’m using as a background image for a search page, and I’m using CSS to set it because I’m working within Backbone.js contexts:

background-image: url("whatever.jpg"); 

I want to apply a CSS 3 blur filter only to the background, but I’m not sure how to style just that one element. If I try:

-webkit-filter: blur(5px); -moz-filter: blur(5px); -o-filter: blur(5px); -ms-filter: blur(5px); filter: blur(5px); 

just underneath background-image in my CSS, it styles the whole page, rather than just the background. Is there a way to select just the image and apply the filter to that? Alternatively, is there a way to just turn the blur off for every other element on the page?

22 Answers 22

You will have to use two different containers, one for the background image and the other for your content.

In the example, I have created two containers, .background-image and .content .

Both of them are placed with position: fixed and left: 0; right: 0; . The difference in displaying them comes from the z-index values which have been set differently for the elements.

  
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Apologies for the Lorem Ipsum text.

Источник

How to Add a Blur Filter to the Background Image

In this snippet, you can find out how to apply a blur filter to the background image. It is very simple and fast!

Follow up the steps and create a blurred background image for your website.

Create HTML

• Begin by creating a element with a class of «image».
• Create another element with a class name «text». Here, also add , , and elements.

div class="image"> div> div class="text"> h1>W3DOCS h1> h2>Blurred Background Image h2> p>Snippet p> div>

Add CSS

• Add the link of the image with the background-image property.
• Set the height of the image with the height property, then specify the position of the image with the background-position property. Here, we set the «center» value.
• After applying the background-position , make the image not repeated by setting the background-repeat property to «no-repeat».
• Specify the background-size into «cover», which scales background image as large as possible to cover all the background area.
• Use the filter property to make our image blur. The filter property has the «blur» value, which applies blur on an image. It is specified in pixels. The larger the value, the more blur will be applied. We set it to «5px».

Do not forget to add -Webkit- for Safari, Google Chrome, and Opera (newer versions), -Moz- for Firefox, -o- for older versions of Opera with the filter property.

Here is what we have. We’re going close to the end!

.image < background-image: url("/uploads/media/default/0001/05/15552fb22caf79be6cc2c60b9a1afe9016889422.jpeg"); height: 100%; background-position: center; background-repeat: no-repeat; background-size: cover; filter: blur(5px); -webkit-filter: blur(5px); -moz-filter: blur(5px); -o-filter: blur(5px); -ms-filter: blur(5px); >

So, half of the work is done. Now, style the text by using the color, font-weight, border and other properties.

.text < color: #eeeeee; font-weight: bold; border: 3px solid #cccccc; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 2; width: 80%; padding: 20px; text-align: center; >

Example of adding a blurred background image:

html> html> head> title>Title of the document title> style> body, html < height: 100%; margin: 0; font-family: Arial, Helvetica, sans-serif; > h2 < font-size: 30px; > .image < background-image: url("/uploads/media/default/0001/05/15552fb22caf79be6cc2c60b9a1afe9016889422.jpeg"); height: 100%; background-position: center; background-repeat: no-repeat; background-size: cover; filter: blur(5px); -webkit-filter: blur(5px); -moz-filter: blur(5px); -o-filter: blur(5px); -ms-filter: blur(5px); > .text < color: #eeeeee; font-weight: bold; border: 3px solid #cccccc; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 80%; padding: 20px; text-align: center; > style> head> body> div class="image"> div> div class="text"> h1>W3DOCS h1> h2>Blurred Background Image h2> p>Snippet p> div> body> html>

Result

W3DOCS

Blurred Background Image

Let’s see another example with the blurred background image.

Example of adding a blurred background image using the :checked selector:

html> html> head> title>Title of the document title> style> .background-image < position: fixed; left: 0; right: 0; z-index: 1; display: block; background-image: url(" /uploads/media/default/0001/01/4982c4f43023330a662b9baed5a407e391ae6161.jpeg"); width: 1200px; height: 800px; -webkit-filter: blur(5px); -moz-filter: blur(5px); -o-filter: blur(5px); -ms-filter: blur(5px); filter: blur(5px); > .content < position: fixed; left: 0; right: 0; z-index: 9999; margin-left: 20px; margin-right: 20px; color: #fff; > style> head> body> h2>:checked selector example h2> div class="background-image"> div> div class="content"> p> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis aliquam erat in ante malesuada, facilisis semper nulla semper. Phasellus sapien neque, faucibus in malesuada quis, lacinia et libero. Sed sed turpis tellus. Etiam ac aliquam tortor, eleifend rhoncus metus. Ut turpis massa, sollicitudin sit amet molestie a, posuere sit amet nisl. Mauris tincidunt cursus posuere. Nam commodo libero quis lacus sodales, nec feugiat ante posuere. Donec pulvinar auctor commodo. Donec egestas diam ut mi adipiscing, quis lacinia mauris condimentum. Quisque quis odio venenatis, venenatis nisi a, vehicula ipsum. Etiam at nisl eu felis vulputate porta. p> p> Fusce ut placerat eros. Aliquam consequat in augue sed convallis. Donec orci urna, tincidunt vel dui at, elementum semper dolor. Donec tincidunt risus sed magna dictum, quis luctus metus volutpat. Donec accumsan et nunc vulputate accumsan. Vestibulum tempor, erat in mattis fringilla, elit urna ornare nunc, vel pretium elit sem quis orci. Vivamus condimentum dictum tempor. Nam at est ante. Sed lobortis et lorem in sagittis. In suscipit in est et vehicula. p> div> body> html>

Источник

backdrop-filter

The backdrop-filter CSS property lets you apply graphical effects such as blurring or color shifting to the area behind an element. Because it applies to everything behind the element, to see the effect you must make the element or its background at least partially transparent.

Try it

Syntax

/* Keyword value */ backdrop-filter: none; /* URL to SVG filter */ backdrop-filter: url(commonfilters.svg#filter); /* values */ backdrop-filter: blur(2px); backdrop-filter: brightness(60%); backdrop-filter: contrast(40%); backdrop-filter: drop-shadow(4px 4px 10px blue); backdrop-filter: grayscale(30%); backdrop-filter: hue-rotate(120deg); backdrop-filter: invert(70%); backdrop-filter: opacity(20%); backdrop-filter: sepia(90%); backdrop-filter: saturate(80%); /* Multiple filters */ backdrop-filter: url(filters.svg#filter) blur(4px) saturate(150%); /* Global values */ backdrop-filter: inherit; backdrop-filter: initial; backdrop-filter: revert; backdrop-filter: revert-layer; backdrop-filter: unset; 

Values

No filter is applied to the backdrop.

Formal definition

Initial value	none
Applies to	all elements; In SVG, it applies to container elements excluding the element and all graphics elements
Inherited	no
Computed value	as specified
Animation type	a filter function list

Formal syntax

backdrop-filter =
none |

=
[ | ]+

=
|
|
|
|
|
|
|
|
|

=
url( * ) |
src( * )

=
blur( ? )

=
brightness( [ | ]? )

=
contrast( [ | ]? )

=
drop-shadow( [ ? && ] )

=
grayscale( [ | ]? )

=
hue-rotate( [ | ]? )

=
invert( [ | ]? )

=
opacity( [ | ]? )

=
sepia( [ | ]? )

=
saturate( [ | ]? )

Examples

CSS

.box  background-color: rgb(255 255 255 / 0.3); backdrop-filter: blur(10px); > body  background-image: url("anemones.jpg"); > 

html, body  height: 100%; width: 100%; > .container  background-size: cover; align-items: center; display: flex; justify-content: center; height: 100%; width: 100%; > .box  border-radius: 5px; font-family: sans-serif; text-align: center; max-width: 50%; max-height: 50%; padding: 20px 40px; > 

HTML

div class="container"> div class="box"> p>backdrop-filter: blur(10px)p> div> div> 

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

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This page was last modified on May 31, 2023 by MDN contributors.

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