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+---
+title: Pulse loader
+tags: animation,beginner
+---
+
+Creates a pulse effect loader animation using the `animation-delay` property.
+
+```html
+<div class="ripple-loader">
+  <div></div>
+  <div></div>
+</div>
+```
+
+```css
+.ripple-loader {
+  position: relative;
+  width: 64px;
+  height: 64px;
+}
+
+.ripple-loader div {
+  position: absolute;
+  border: 4px solid #76ff03;
+  border-radius: 50%;
+  animation: ripple-loader 1s ease-out infinite;
+}
+
+.ripple-loader div:nth-child(2) {
+  animation-delay: -0.5s;
+}
+
+@keyframes ripple-loader {
+  0% {
+    top: 32px;
+    left: 32px;
+    width: 0;
+    height: 0;
+    opacity: 1;
+  }
+  100% {
+    top: 0;
+    left: 0;
+    width: 64px;
+    height: 64px;
+    opacity: 0;
+  }
+}
+```
+
+#### Explanation
+
+- Use `@keyframes` to define an animation at two points in the cycle, start (`0%`), where the two `<div>` elements have no `width` or `height` and are positioned at the center and end (`100%`), where both `<div>` elements have increased `width` and `height`, but their `position` is reset to `0`.
+- Use `opacity` to transition from `1` to `0` when animating to give the `<div>` elements a disappearing effect as they expand.
+- `.ripple-loader`, which is the parent container, has a predefined `width` and `height`. It uses `position: relative` to position its children.
+- Use `animation-delay` on the second `<div>` element, so that each element starts its animation at a different time.
+
+#### Browser support
+
+- https://caniuse.com/#feat=css-animation