css blur background behind div with code examples

CSS Blur Background Behind Div: Code Examples

Blurring the background behind a div element is a popular visual effect that can help create a more aesthetically pleasing design on a webpage. It can be used to highlight the content within a div by making it stand out against the blurred background. In this article, we will look at how to create a blurred background behind a div using CSS and provide code examples to help you understand the process.

The CSS property that is used to create a blurred background is the "backdrop-blur" property. This property was introduced in CSS3 and allows you to blur the background behind an element. To use the backdrop-blur property, you need to set a value for the blur radius. The higher the value, the greater the blur effect will be.

Here's an example of how to use the backdrop-blur property to create a blurred background behind a div:

<style>
  .blurred-div {
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-blur: 10px;
  }
</style>

<div class="blurred-div">
  <p>This is some content that is displayed on a blurred background</p>
</div>

In this example, we first define a CSS class called "blurred-div". This class sets the background color of the div to a translucent black color with an opacity of 0.5, and sets the backdrop-blur property to 10px. The resulting effect will be a blurred background behind the div with a black color.

It is important to note that the backdrop-blur property is not supported in all browsers, so it may not work in older versions of Internet Explorer or other outdated browsers. To ensure that the blurred background effect is displayed correctly in all browsers, it may be necessary to use a fallback method such as using a blurred image as the background.

Here's an example of how to create a blurred background using an image:

<style>
  .blurred-div {
    background-image: url(blurred-background.jpg);
    background-size: cover;
  }
</style>

<div class="blurred-div">
  <p>This is some content that is displayed on a blurred background</p>
</div>

In this example, we first define a CSS class called "blurred-div". This class sets the background image of the div to an image file named "blurred-background.jpg" and sets the background-size property to "cover" to ensure that the image covers the entire div. The resulting effect will be a blurred background behind the div created using the blurred image.

It's also possible to create a blurred background using a combination of CSS and JavaScript. Here's an example of how to do this:

<style>
  .blurred-div {
    background-color: rgba(0, 0, 0, 0.5);
  }
</style>

<div class="blurred-div">
  <p>This is some content that is displayed on a blurred background</p>
</div>

<script>
  var blurredDiv = document.querySelector('.blurred-div');
  blurredDiv.style.backdropFilter = 'blur(10px)';
</script>

In this example, we first define a CSS class called "blurred
In addition to creating a blurred background, there are other visual effects that can be achieved using CSS. One such effect is the use of box-shadow to create a shadow around an element. The box-shadow property allows you to add a shadow to an element by specifying the horizontal offset, vertical offset, blur radius, and spread radius of the shadow.

Here's an example of how to use the box-shadow property to create a shadow around a div:

<style>
  .shadowed-div {
    box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
  }
</style>

<div class="shadowed-div">
  <p>This is some content that is displayed with a shadow</p>
</div>

In this example, we first define a CSS class called "shadowed-div". This class sets the box-shadow property to a value of 10px horizontal offset, 10px vertical offset, 5px blur radius, and 0px spread radius, with a black color and an opacity of 0.75. The resulting effect will be a shadow around the div with the specified properties.

Another popular effect is the use of transform property to rotate, scale, or skew an element. The transform property allows you to apply a 2D or 3D transformation to an element by specifying values for the transformation matrix.

Here's an example of how to use the transform property to rotate a div:

<style>
  .rotated-div {
    transform: rotate(45deg);
  }
</style>

<div class="rotated-div">
  <p>This is some content that is displayed rotated by 45 degrees</p>
</div>

In this example, we first define a CSS class called "rotated-div". This class sets the transform property to a value of "rotate(45deg)" to rotate the div by 45 degrees. The resulting effect will be a div that is rotated by 45 degrees.

These are just a few examples of the visual effects that can be achieved using CSS. With CSS, you have a lot of control over the appearance of elements on a webpage, and by combining different properties and techniques, you can create a wide range of visually appealing designs.

Popular questions

1. How do you create a blurred background in CSS?

To create a blurred background in CSS, you can use the backdrop-blur property in conjunction with the backdrop-filter property. The backdrop-blur property sets the level of blur for the background, while the backdrop-filter property applies the blur effect to the background. Here's an example:

<style>
  .blurred-background {
    backdrop-blur: 10px;
    backdrop-filter: blur(10px);
  }
</style>

<div class="blurred-background">
  <p>This is some content displayed on a blurred background</p>
</div>

2. What is the syntax for the backdrop-filter property?

The syntax for the backdrop-filter property is as follows:

backdrop-filter: <filter-function> [<filter-function> [<filter-function> ...]]

Where <filter-function> is the function that defines the filter effect to apply, such as blur() or brightness().

3. What is the syntax for the backdrop-blur property?

The syntax for the backdrop-blur property is as follows:

backdrop-blur: <length>

Where <length> is a length value that specifies the level of blur for the background.

4. How do you use multiple filter functions with the backdrop-filter property?

To use multiple filter functions with the backdrop-filter property, simply list the functions separated by spaces. For example:

<style>
  .blurred-and-brightened-background {
    backdrop-blur: 10px;
    backdrop-filter: blur(10px) brightness(150%);
  }
</style>

<div class="blurred-and-brightened-background">
  <p>This is some content displayed on a blurred and brightened background</p>
</div>

In this example, both the blur() and brightness() functions are applied to the background.

5. Is the backdrop-filter property supported by all browsers?

No, the backdrop-filter property is not supported by all browsers. At the time of writing, it is supported in Chrome, Safari, and Firefox, but not in Internet Explorer or Edge. To ensure that your blurred background is supported across all browsers, you may need to use a fallback technique, such as using a blurred image as the background.

Tag

BlurEffects