JSFiddle - React, Tailwind, and code Playground

CSS Loader CSS loader, inspired by Dan Edens iOS7 Toggle Pen: http://codepen.io/daneden/pen/cmIHG

by Jennifer Perrin

HTML

<div class='loader'></div>

CSS

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

html, body {
  height: 100%;
}

.loader {
  width: 400px;
  height: 40px;
  background-color: #dddddd;
  top: 30%;
  left: 50%;
  margin: -40px -200px;
  position: absolute;
  border-radius: 100px;
  box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.05);
}

.loader:after {
  border-radius: 100px;
  content: "";
  position: absolute;
  background-color: white;
  left: 2px;
  top: 2px;
  bottom: 2px;
  right: 360px;
  animation-name: slide;
  animation-duration: 2s;
  animation-easing-function: linear;
  animation-iteration-count: infinite;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

@keyframes slide {
  0% {
    right: 360px;
    left: 2px;
  }

  5% {
    left: 2px;
  }

  50% {
    right: 2px;
    left: 360px;
  }

  55% {
    right: 2px;
  }

  100% {
    right: 360px;
    left: 2px;
  }
}