.push-pop.loader
  div
  div
.push-out.loader
  div
  div

body {
  --primary: #fff;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #663399;  
}

*,
*:after,
*:before {
  box-sizing: border-box;
}

.loader {
  margin: 50px;
}

/**
  * push-pop
  * lil push pop effect, push one side out and one side in
  * @author jh3y
*/

.push-pop {
  --duration: .85;
  height: 100px;
  width: 100px;
  position: relative;
  overflow: hidden;

  // Use the first div for shifting the block from side to side
  & > div:nth-of-type(1) {
    height: 20px;
    width: 20px;
    position: absolute;
    animation: push-pop-slide calc(var(--duration) * 1s) infinite alternate ease-in-out;
    transform: translate(0, -100%);
    top: 100%;
    left: 0;

    &:after {
      animation: push-pop-flip calc(var(--duration) * 1s) infinite alternate ease-in-out;
      background: var(--primary);
      content: '';
      height: 100%;
      position: absolute;
      width: 100%;
    }
  }

  // Use the second for the staionary pillar
  & > div:nth-of-type(2) {
    background: var(--primary);
    height: 30px;
    left: 50%;
    position: absolute;
    top: 100%;
    transform: translate(-50%, -100%);
    width: 20px;
  }

  // Use the pseudo elements for the shifting pillars
  &:after,
  &:before {
    animation: push-pop-pushed calc(var(--duration) * 1s) alternate infinite ease;
    background: var(--primary);
    bottom: 0;
    content: '';
    height: 40px;
    position: absolute;
    width: 20px;
  }

  &:before {
    animation: push-pop-pushed calc(var(--duration) * 1s) alternate-reverse infinite ease;
    left: 0;
  }

  &:after {
    right: 0;
  }
}

@keyframes push-pop-pushed {
  0%, 72.5% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(0, 100%);
  }
}

@keyframes push-pop-flip {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(0, -80px) rotate(90deg);
  }
  100% {
    transform: translate(0, 0) rotate(180deg);
  }
}

@keyframes push-pop-slide {
  to {
    transform: translate(0, -100%) translate(80px, 0);
  }
}



/**
  * push-out
  * lil push out effect, push one side out and one side in
  * @author jh3y
*/

.push-out {
  --duration: .85;
  height: 100px;
  width: 100px;
  position: relative;
  overflow: hidden;

  // Use the first div for shifting the block from side to side
  & > div:nth-of-type(1) {
    height: 20px;
    width: 20px;
    position: absolute;
    animation: push-out-slide calc(var(--duration) * 1s) infinite alternate ease-in-out;
    transform: translate(0, -100%);
    top: 100%;
    left: 0;

    &:after {
      animation: push-out-flip calc(var(--duration) * 1s) infinite alternate ease-in-out;
      background: var(--primary);
      content: '';
      height: 100%;
      position: absolute;
      width: 100%;
    }
  }

  // Use the second for the staionary pillar
  & > div:nth-of-type(2) {
    background: var(--primary);
    height: 30px;
    left: 50%;
    position: absolute;
    top: 100%;
    transform: translate(-50%, -100%);
    width: 20px;
  }

  // Use the pseudo elements for the shifting pillars
  &:after,
  &:before {
    animation-timing-function: ease;
    animation-iteration-count: infinite;
    animation-duration: calc(var(--duration) * 4s);
    background: var(--primary);
    bottom: 0;
    content: '';
    height: 40px;
    position: absolute;
    width: 20px;
  }

  &:after {
    animation-name: push-out-pushed-1;
    right: 0;
  }

  &:before {
    animation-name: push-out-pushed-2;
    left: 0;
  }

}

@keyframes push-out-pushed-1 {
  0%, 18.125%, 50%, 68.125%, 100% {
    transform: translate(0, 0);
  }
  25%, 43.125%, 75%, 93.125% {
    transform: translate(0, 100%);
  }

}

@keyframes push-out-pushed-2 {
  0%, 18.125%, 50%, 68.125%, 100% {
    transform: translate(0, 100%);
  }
  25%, 43.125%, 75%, 93.125% {
    transform: translate(0, 0);
  }

}

@keyframes push-out-flip {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(0, -80px) rotate(90deg);
  }
  100% {
    transform: translate(0, 0) rotate(180deg);
  }
}

@keyframes push-out-slide {
  to {
    transform: translate(0, -100%) translate(80px, 0);
  }
}