Google uses many different loading animations. The one we’ll be recreating today has four differently colored balls, bouncing in a horizontal line.

First we’ll need some <div>s to manipulate.

<div class="wrapper">
  <div class="blue ball">
  <div class="red ball">
  <div class="yellow ball">
  <div class="green ball">
</div>

That’s all the HTML that’s needed. Everything else is in CSS.

For the sake of example, I want the animation to appear centered on the page. I’ll use the flexbox model for this.

.wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
}

There are a few common properties of all four balls.

.ball {
  width: 22px;
  height: 22px;
  border-radius: 11px;
  margin: 0 10px;
}

The equal width and height makes them squares, and the border-radius rounds the corners all the way until they appear round. The margin spaces them apart from one-another.

Each of the balls will have a different color. Here they are:

.blue   { background-color: #4285F5; }
.red    { background-color: #EA4436; }
.yellow { background-color: #FBBD06; }
.green  { background-color: #34A952; }

We want all the balls to bounce, so we’ll define the keyframes (or keyframe, actually) for an animation called “bounce”.

@keyframes bounce {
  50% {
    transform: translateY(25px);
  }
}

This single keyframe states that the ball should be translated (moved) 25 pixels down on the Y (vertical) axis 50% through the animation. Because there are no other keyframes, it can be inferred that each ball will be sitting at it’s original position at 0% at 100% through the animation. This gives the bouncing effect.

Let’s apply the animation to the all four balls.

.ball {
  width: 22px;
  height: 22px;
  border-radius: 11px;
  margin: 0 10px;

  **animation: 2s bounce ease infinite;**
}

The balls will bounce every 2 seconds indefinitely. They will be eased in and out.

There’s one problem: all four balls bounce at the same time. We can fix this by applying a different animation-delay on each one.

.red {
  background-color: #EA4436;
  **animation-delay: .25s;**
}

.yellow {
  background-color: #FBBD06;
  animation-delay: .5s;
}

.green {
  background-color: #34A952;
  animation-delay: .75s;
}

Why is .blue missing in the code above? Because we don’t want to delay that ball. It should start bouncing immediately.

That’s it. The complete code looks like this:

<!-- HTML -->

<div class="wrapper">
  <div class="blue ball"></div>
  <div class="red ball"></div>  
  <div class="yellow ball"></div>  
  <div class="green ball"></div>  
</div>


/* CSS */

.wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px
}

.ball {
  width: 22px;
  height: 22px;
  border-radius: 11px;
  margin: 0 10px;

  animation: 2s bounce ease infinite;
}

.blue {
  background-color: #4285F5;
}

.red {
  background-color: #EA4436;
  animation-delay: .25s;
}

.yellow {
  background-color: #FBBD06;
  animation-delay: .5s;
}

.green {
  background-color: #34A952;
  animation-delay: .75s;
}

@keyframes bounce {  
    50% {
        transform: translateY(25px);
    }
}

And the result looks like this: