<!doctype>
<html>
  <head>
    <meta charset="utf-8">
    <title>Neumorphism Animation</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div class="loader">
      <div style="--i:0"></div>
      <div style="--i:1"></div>
      <div style="--i:2"></div>
      <div style="--i:3"></div>
      <div style="--i:4"></div>
    </div>
  </body>
</html>
*
{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body
{
  display: flex;
  justify-content: center;
  align-items: center;
  background: #edf1f4;
  min-height: 100vh;
}
.loader
{
  display: flex;
  flex-direction: row;
}
.loader div
{
  position: relative;
  width: 40px;
  height: 200px;
  margin: 20px;
  overflow: hidden;
  border-radius: 40px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.05,#edf1f4));
  border: 2px solid #edf1f4;
  box-shadow: 15px 15px 20px rgba(0,0,0,0.1),
            -15px -15px 20px #fff,
            inset -5px -5px 5px  rgba(255,255,255,0.5),
            inset 5px 5px 5px rgba(0,0,0,0.05);
}
.loader div::before
{
  content: "";
  position: absolute;
  top 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  border-radius: 40px;
  box-shadow: 15px 15px 20px rgba(0,0,0,0.1),
            -15px -15px 20px #fff,
            inset -5px -5px 5px  rgba(255,255,255,0.5),
            inset 5px 5px 5px rgba(0,0,0,0.05);
}
.loader div::after
{
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 36px;
  height: 36px;
  background: #fff;
  border-radius: 50%;
  box-shadow: inset -5px -5px 5px rgba(0,0,0,0.2), 0 420px 0 400px #2196f3;
  animation: animate 2.5s ease-in-out infinite;
  transform: translateY(160px);
  animation-delay: calc(-0.5s * var(--i));
}
@keyframes animate
{
  0%
  {
    transform: translateY(160px);
    filter: hue-rotate(180deg);
  }
  50%
  {
    transform: translateY(0px);
  }
  100%
  {
    transform: translateY(160px);
    filter: hue-rotate(0deg);
  }
}
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