Animated CSS loaders

Loading indicators are a staple of modern web design. They keep users engaged while they wait for content to load. With a little HTML and CSS, you can create a variety of loaders to suit your needs. Here are some examples to get you started.
https://codepen.io/chalarangelo/pen/LYwVvVr
For the bouncing loader, you'll need a parent with three elements, one for each ball. Use @keyframes to define a bouncing animation, using the opacity and transform properties. Use a single axis translation on transform: translate3d() to achieve better animation performance.
For the container, you'll have to set display: flex and justify-content: center to position the balls in the center. Give each ball the same width and height and border-radius: 50% to make them circular. Apply the animation to each ball, using a different animation-delay for each and animation-direction: alternate to create the appropriate effect.
For the pulse loader, you'll need a parent container with two child elements, one for each ring. Use @keyframes to define an animation at two points in the cycle. At the start (0%), the two child elements have no width or height and are positioned at the center. At the end (100%), both 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 them a disappearing effect as they expand.

<div class="bouncing-loader">
  <div></div>
  <div></div>
  <div></div>
</div>

For the bouncing loader, you'll need a parent with three elements, one for each ball. Use @keyframes to define a bouncing animation, using the opacity and transform properties. Use a single axis translation on transform: translate3d() to achieve better animation performance.
For the container, you'll have to set display: flex and justify-content: center to position the balls in the center. Give each ball the same width and height and border-radius: 50% to make them circular. Apply the animation to each ball, using a different animation-delay for each and animation-direction: alternate to create the appropriate effect.
For the pulse loader, you'll need a parent container with two child elements, one for each ring. Use @keyframes to define an animation at two points in the cycle. At the start (0%), the two child elements have no width or height and are positioned at the center. At the end (100%), both 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 them a disappearing effect as they expand.
Set a predefined width and height for the parent container and use position: relative to position its children. Use animation-delay on the second child, so that each element starts its animation at a different time.
For the donut spinner, you'll need a single element. Use a semi-transparent border for the whole element. Exclude one side that will serve as the loading indicator for the donut. Define and use an appropriate animation, using transform: rotate() to rotate the element.

From 30-seconds-of-code: loaders