How to Create CSS Animated Blobs in Under TWO Minutes

When it comes to adding flair and style to your website, animation plays a significant role. One of the most captivating and dynamic effects you can use is animated blobs

Technology Apr 18, 2025 19 Add to Reading List

When it comes to adding flair and style to your website, animation plays a significant role. One of the most captivating and dynamic effects you can use is animated blobs. Blobs are organic, fluid-like shapes that often move, transform, and morph in interesting ways. They can add an element of surprise, engagement, and creativity to your designs technology blog.

In this tutorial, we’ll show you how to create CSS animated blobs in under two minutes using pure CSS, and we’ll explore some ideas to extend and customize them for different uses.

What Are CSS Animated Blobs?

CSS animated blobs are smooth, flowing, and irregular shapes created entirely using CSS. These blobs can morph and change shapes or colors in response to user interactions or on a continuous loop. The beauty of using CSS for these animations is that it’s lightweight, fast, and doesn’t require JavaScript or any external libraries.

Step 1: Create a Basic HTML Structure

First, we need to set up a simple HTML structure. Open your text editor and create a new file called index.html.

In this structure, we’ve created a div with a class of blob that will serve as the animated blob.

Step 2: Style the Blob Using CSS

Now, let’s write the CSS to create the blob. You can add the following code in a new file called styles.css.

css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f0f0f0;
}

.blob {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background-color: #3498db;
  animation: blobAnimation 5s infinite ease-in-out;
}

@keyframes blobAnimation {
  0% {
    transform: scale(1) translate(0, 0);
    border-radius: 50%;
  }
  25% {
    transform: scale(1.2) translate(10px, -10px);
    border-radius: 40%;
  }
  50% {
    transform: scale(1.1) translate(-20px, 20px);
    border-radius: 60%;
  }
  75% {
    transform: scale(1.3) translate(20px, -10px);
    border-radius: 30%;
  }
  100% {
    transform: scale(1) translate(0, 0);
    border-radius: 50%;
  }
}

Explanation of the CSS Code:

body: We're setting up a full-page container using display: flex to center the blob in the middle of the screen.
.blob: This is the div that represents the blob. We give it a fixed size (200px by 200px), apply a circular shape using border-radius: 50%, and set a background color (in this case, a blue shade).
@keyframes blobAnimation: This is where the magic happens. The blob animates through different states by changing its scale, position (translate), and border-radius (making it go from circular to more organic-looking).
- The transform property is used to scale and move the blob.
- The border-radius is animated to change the shape of the blob, making it morph from a circle to more irregular forms.

Result:

When you open this HTML file in a browser, you’ll see a smooth, animated blob that changes size, shape, and position. The animation will repeat continuously, creating a fluid, organic effect.

Step 3: Customize Your Blob Animation

Now that you know how to create a basic animated blob, let's explore a few ways to customize and enhance it:

1. Add More Color Transitions

You can make the blob more visually interesting by changing its colors during the animation. Modify the @keyframes to include color transitions like this:

css

@keyframes blobAnimation {
  0% {
    transform: scale(1) translate(0, 0);
    border-radius: 50%;
    background-color: #3498db;
  }
  25% {
    transform: scale(1.2) translate(10px, -10px);
    border-radius: 40%;
    background-color: #9b59b6;
  }
  50% {
    transform: scale(1.1) translate(-20px, 20px);
    border-radius: 60%;
    background-color: #2ecc71;
  }
  75% {
    transform: scale(1.3) translate(20px, -10px);
    border-radius: 30%;
    background-color: #e74c3c;
  }
  100% {
    transform: scale(1) translate(0, 0);
    border-radius: 50%;
    background-color: #3498db;
  }
}

Here, we’ve added a color change with each keyframe, so the blob will transition between four different colors.

2. Add More Blobs

You can create a collection of blobs by duplicating the .blob class with different sizes, colors, and animations.

Then, modify the CSS to create different animation effects for each blob:

You can now create multiple blobs, each with unique movements and transitions.

3. Make the Blob Interactive

What if you want to make the blob interactive, changing shape or color when the user hovers over it? This can easily be done with a hover effect:

Here, when the user hovers over the blob, it will change to an orange color and increase in size.

Step 4: Experiment With Advanced Effects

You can get even more creative by using SVG blobs or CSS pseudo-elements to create more complex and visually striking blob animations. For example:

Using multiple layers: Create layered blobs that move at different speeds or morph into each other.
SVG paths: Use SVG animations to create more complex shapes and morphing effects.

For instance, using an SVG blob shape can give you more control over the path it follows:

You can animate the SVG paths using CSS to create custom motion effects.

Conclusion

Creating CSS animated blobs is not only fun but also a great way to add dynamic visuals to your website in under two minutes. By leveraging the power of CSS animations, you can create smooth, organic shapes that enhance user experience and engage visitors. Whether you’re using simple blob shapes or more complex interactions, you have endless possibilities for customization.