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HTML 

              
                <h2>Squash and Stretch</h2>
<div class="flex__grid">
  <!-- Gives physical appearance during interaction -->
  <button class="btn btn--squash-stretch">Continue</button>

</div>

<h2>Anticipation</h2>
<div class="flex__grid">
  <!-- Draws attention to user to prepare them for a bigger action -->
  <button class="btn btn--anticipation">Subscribe</button>

</div>

<h2>Staging</h2>
<div class="flex__grid">
  <!-- Projecting the intentions of the element to a user -->
  <button class="btn btn--staging">Loading</button>

</div>

<h2>Pose 2 Pose/Straight Ahead</h2>
<div class="flex__grid">
  <!-- Showing the user a change in form for leading across the interface or new feature that's accessible -->
  <button class="btn btn--pose-2-pose">Loading</button>

</div>

<h2>Follow through/Overlap</h2>
<div class="flex__grid">
  <!-- Staggering motion of the main element as other pieces react to the motion change -->
  <button class="btn btn--follow-through">Submit</button>

</div>

<h2>Slow in & Slow out</h2>
<div class="flex__grid">
  <!-- Defining a natural motion by slowing the animation and speeding it up during an element/feature introduction -->
  <button class="btn btn--slow-in-out">Continue</button>

</div>

<h2>Arcs</h2>
<div class="flex__grid">
  <!-- Gives variety and natural motion to elements -->
  <button class="btn btn--arcs">Begin</button>

</div>

<h2>Secondary Action</h2>
<div class="flex__grid">
  <!-- Other elements react to primary actions to give more personality to main animation -->
  <button class="btn btn--secondary-action">Wait!</button>
  <button class="btn btn--secondary-action--sibling">Wait!</button>
  <button class="btn">Wait!</button>

</div>

<h2>Timing</h2>
<div class="flex__grid">
  <!-- Set up proper fast or slow animations with extending the time or shortening it, does a user need to see it for 5 seconds or a quarter second -->
  <button class="btn btn--fast">Fast</button>
  
  <button class="btn btn--slow">Slow</button>

</div>

<h2>Exaggeration</h2>
<div class="flex__grid">
  <!-- If this element's motion is mimiced to real life, give it excessive values to close out it's animation to call attention and bring user's focus to the action -->
  <button class="btn btn--exaggeration">Continue</button>

</div>

<h2>Solid Drawings</h2>
<div class="flex__grid">
  <!-- Element is presented in a consistent 3D nature to give weight and space -->
  <button class="btn btn--solid">Continue</button>

</div>

<h2>Appeal</h2>
<div class="flex__grid">
  <!-- Motion has personality and light hearted motion to connect with the user -->
  <button class="btn btn--appeal">Continue</button>

</div>

<h4><a href="https://vimeo.com/93206523" target="_blank">The Illusion of Life</a></h4>
!

CSS 

              
                body {
  
}

h1,
h2,
h3,
h4 {
  text-align: center;
}

.flex__grid {
  display: flex;
  justify-content: center;
  transform-style: preserve-3d;
  transform-origin: center;
  perspective: 300px;
}

.btn {
  position: relative;
  z-index: 1;
  color: hsl(300, 70%,20%);
  background-color: transparent;
  border: none;
  margin: 1rem;
  padding: 1rem 1.5rem;
  outline: none;
  font-variant: small-caps;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 1px;
  
  &:after,
  &:before {
    content: '';
    position: absolute;
    z-index: -1;
  }
  
  &:after {
    border-radius: 0.5rem;
    width: 100%;
    margin: auto;
    background-color: hsl(302, 41%, 76%);
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    box-shadow: 0 0.25rem 0 0.05rem hsla(302, 41%, 50%, 1);
    transform-origin: center;
    transform: translate(0%, 0%);
    transition: all 0.25s ease;
  }
}

.btn--squash-stretch {
  
  &:after {
    animation: 4s infinite squash-stretch;
  }
}

.btn--anticipation {
  
  &:after {
    animation: 0.5s ease-in-out infinite alternate anticipation;
  }
}

.btn--staging {
  
  &:after {
    transform-origin: center;
    transform: translate(0%, 0%);
    animation: 
      0.25s ease-out forwards pose-2-pose,
      0.75s linear 0.25s staging infinite ;
  }
}

.btn--pose-2-pose {
  
  &:after {
    transform-origin: center;
    transform: translate(0%, 0%);
    animation: 
      0.75s ease-out infinite pose-2-pose alternate;
  }
}

.btn--follow-through {
  opacity: 0;
  transform: translate(100%);
  animation: 1s cubic-bezier(1, 0.02, 0.39, 1.52) infinite follow-through;
  
  &:after {
    transform: translate(25%);
  animation: 1s cubic-bezier(.04,.14,.89,1.74) infinite follow-through;
  }
}

.btn--slow-in,
.btn--slow-out,
.btn--slow-in-out {
  opacity: 0;
  transform: translateY(-100%) rotateX(90deg);
  animation: 3s cubic-bezier(1, 0.02, 0.39, 1.52) infinite alternate slide-in;
}

.btn--slow-in {
  animation: 3s cubic-bezier(1, 0.02, 0.39, 1.52) infinite forwards slide-in;
}

.btn--slow-out {
  animation: 3s cubic-bezier(1, 0.02, 0.39, 1.52) infinite reverse slide-in;
}

.btn--arcs {
  &,
  &:after {
    opacity: 0;
    transform-origin: 0% 0%;
    transform: translate(200%, -60%) rotate(70deg);
    animation: 2s cubic-bezier(1, 0.02, 0.39, 1.5) infinite arcs;
  }
}

.btn--secondary-action {
  transform: translate(0);
  animation: 1s infinite cubic-bezier(1, 0.02, 0.39, 1.52) secondary-action;
}

.btn--secondary-action--sibling {
  transform: translate(0);
  animation: 1s -0.22s infinite cubic-bezier(1, 1.02, 0.81, 1.39) secondary-action--sibling;
}

.btn--fast {
  transform: scale(0, 0);
  animation: 2s infinite ease reverse timing-fast;
}

.btn--slow {
  transform: scale(1, 1);
  animation: 2s infinite ease timing-slow;
}

.btn--exaggeration {
  opacity: 0;
  transform: translate(0, -100%) scale(1, 1);
  animation: 2s cubic-bezier(1, 1.02, 0.81, 1.39) infinite exaggeration;
}

.btn--solid {
  animation: 2s ease-in-out infinite alternate solid-drawing;
}

.btn--appeal {
  
  &:after {
    animation: 2s cubic-bezier(0.79, 0.14, 0.15, 0.86) infinite appeal;
  }
}

@keyframes squash-stretch {
  92% {
    transform: scale(1, 1);
  }
  94% {
    transform: scale(1.75, 0.5);
  }
  100% {
    transform: scale(1, 1);
  }
}

@keyframes staging {
  0% {
    transform: translate(-50%, -50%) rotate(0deg) scale(1, 1);
    box-shadow: 1em 0em 0 0 hsla(302, 41%, 50%, 1);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg) scale(1, 1);
    box-shadow: 1em 0 0 0 hsla(302, 41%, 50%, 1);
  }
}

@keyframes pose-2-pose {
  0% {
    width: 100%;
  }
  25% {
    width: 1em;
    padding-top: 1em;
  }
  100% {
    top: 50%;
    right: calc(-50% - 2rem);
    bottom: 50%;
    left: 50%;
    width: 1em;
    padding-top: 1em;
    margin: auto;
    border-radius: 50%;
    transform: translate(-50%, -50%);
  }
}

@keyframes anticipation {
  0% {
    transform: rotate(2.5deg);
  }
  100% {
    transform: rotate(-2.5deg);
  }
}

@keyframes follow-through {
  100% {
    opacity: 1;
    transform: translate(0%);
  }
}

@keyframes slide-in {
  25%, 75% {
    opacity: 1;
    transform: translateY(0%) rotateX(0deg);
  }
}

@keyframes arcs {
  50%, 100% {
    opacity: 1;
    transform-origin: 100% 50%;
    transform: translate(0, 0) rotate(0deg);
  }
}

@keyframes secondary-action {
  0% {
    transform: translate(0%);
  }
  60% {
    transform: translate(28%);
  }
  100% {
    transform: translate(0%);
  }
}

@keyframes secondary-action--sibling {
  70% {
    transform: translate(0);
  }
  80% {
    transform: translate(10%);
  }
  100% {
    transform: translate(0%);
  }
}

@keyframes timing-fast {
  25%, 100% {
    transform: scale(1, 1);
  }
}

@keyframes timing-slow {
  95%, 100% {
    transform: scale(0, 0);
  }
}

@keyframes exaggeration {
  10% {
    opacity: 1;
    transform: translate(0, 90%) scale(2, 0.25);
  }
  15%, 100% {
    opacity: 1;
    transform: translate(0, 0) scale(1, 1);
  }
}

@keyframes solid-drawing {
  0% {
    transform: rotateY(25deg);
  }
  100% {
    transform: rotateY(-25deg);
  }
}

@keyframes appeal {
  15% {
    box-shadow: -0.5rem 0.25rem 0 0.05rem hsla(302, 41%, 50%, 1);
  }
  20% {
    box-shadow: 0.5rem 0.25rem 0 0.05rem hsla(302, 41%, 50%, 1);
  }
  25%, 100% {
    box-shadow: 0rem 0.25rem 0 0.05rem hsla(302, 41%, 50%, 1);
  }
}
!

JS
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