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HTML 

              
                <div class="heading">
  <h1>35 Ways to Disappear</h1>
  <h3>Hover over to see us in action!</h3>
</div>
<div class="container">
  <div class="bounceoutup">
    <button class="button">bounce out up</button>
  </div>
  <div class="bounceoutdown">
    <button class="button">bounce out down</button>
  </div>
  <div class="bounceout">
    <button class="button">bounce out</button>
  </div>
  <div class="bounceoutleft">
    <button class="button">bounce out left</button>
  </div>
  <div class="bounceoutright">
    <button class="button">bounce out right</button>
  </div>
  <div class="backoutdown">
    <button class="button">back out down</button>
  </div>
  <div class="backoutleft">
    <button class="button">back out left</button>
  </div>
  <div class="backoutright">
    <button class="button">back out right</button>
  </div>
  <div class="backoutup">
    <button class="button">back out up</button>
  </div>
  <div class="fadeout">
    <button class="button">fade out</button>
  </div>
  <div class="fadeoutdown">
    <button class="button">fade out down</button>
  </div>
  <div class="fadeoutdownbig">
    <button class="button">fade out down big</button>
  </div>
  <div class="fadeoutleft">
    <button class="button">fade out left</button>
  </div>
  <div class="fadeoutleftbig">
    <button class="button">fade out left big</button>
  </div>
  <div class="fadeoutright">
    <button class="button">fade out right</button>
  </div>
  <div class="fadeoutrightbig">
    <button class="button">fade out right big</button>
  </div>
  <div class="fadeoutup">
    <button class="button">fade out up</button>
  </div>
  <div class="fadeoutupbig">
    <button class="button">fade out up big</button>
  </div>
  <div class="fadeouttopleft">
    <button class="button">fade out top left</button>
  </div>
  <div class="fadeouttopright">
    <button class="button">fade out top right</button>
  </div>
  <div class="fadeoutbottomright">
    <button class="button">fade out bottom right</button>
  </div>
  <div class="fadeoutbottomleft">
    <button class="button">fade out bottom left</button>
  </div>
  <div class="flipoutX">
    <button class="button">flip out X</button>
  </div>
  <div class="flipoutY">
    <button class="button">flip out Y</button>
  </div>
  <div class="lightspeedoutright">
    <button class="button">light speed out right</button>
  </div>
  <div class="lightspeedoutleft">
    <button class="button">light speed out left</button>
  </div>
  <div class="rotateout">
    <button class="button">rotate out</button>
  </div>
  <div class="rollout">
    <button class="button">roll out</button>
  </div>
  <div class="zoomoutleft">
    <button class="button">zoom out left</button>
  </div>
  <div class="zoomoutdown">
    <button class="button">zoom out down</button>
  </div>
  <div class="zoomout">
    <button class="button">zoom out</button>
  </div>
  <div class="zoomoutup">
    <button class="button">zoom out up</button>
  </div>
  <div class="rotateoutdownleft">
    <button class="button">rotate out down left</button>
  </div>
  <div class="rotateoutdownright">
    <button class="button">rotate out down right</button>
  </div>
  <div class="zoomoutright">
    <button class="button">zoom out right</button>
  </div>
</div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Work+Sans:600);

$duration: 2s;
$purple: #351c75;
$orange: #e69139;
$lightorange: #fce5cd;

body {
  background-color: $lightorange;
}

h1,
h3 {
  text-align: center;
  font-size: 38px;
  font-family: "Work Sans", sans-serif;
  color: $purple;
}

h3 {
  font-size: 20px;
  color: $orange;
}

p {
  font-size: 18px;
  font-family: "Work Sans", sans-serif;
  color: $purple;
}

button {
  font-size: 12px;
  font-family: "Work Sans", sans-serif;
  color: white;
  background-color: $purple;
  border-radius: 1em;
  height: 3em;
  width: 10em;
  border: none;
  outline: none;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.container {
  display: flex;
  flex-wrap: wrap;
  width: 60%;
  height: 100%;
  justify-content: space-around;
  //border-style: solid;
  padding: 0;
  margin: 40px auto;
  list-style: none;
  background: $lightorange;
}

.bounceoutup,
.bounceoutdown,
.bounceout,
.bounceoutleft,
.bounceoutright,
.backoutdown,
.backoutleft,
.backoutright,
.backoutup,
.fadeout,
.fadeoutdown,
.fadeoutdownbig,
.fadeoutleft,
.fadeoutleftbig,
.fadeoutright,
.fadeoutrightbig,
.fadeoutup,
.fadeoutupbig,
.fadeouttopleft,
.fadeouttopright,
.fadeoutbottomright,
.fadeoutbottomleft,
.flipoutX,
.flipoutY,
.lightspeedoutright,
.lightspeedoutleft,
.rotateout,
.rotateoutdownleft,
.rotateoutdownright,
.rotateoutupleft,
.rotateoutupright,
.rollout,
.zoomout,
.zoomoutdown,
.zoomoutleft,
.zoomoutright,
.zoomoutup {
  flex: 1 0 14%; // enforce 7 per row
  //width: 130px;
  height: 80px;
  text-align: center;
  user-select: none;
}

.bounceoutup:hover > button {
  animation: bounceOutUp $duration;
}

.bounceoutdown:hover > button {
  animation: bounceOutDown $duration;
}

.bounceout:hover > button {
  animation: bounceOut $duration;
}

.bounceoutleft:hover > button {
  animation: bounceOutLeft $duration;
}

.bounceoutright:hover > button {
  animation: bounceOutRight $duration;
}

.backoutdown:hover > button {
  animation: backOutDown $duration;
}

.backoutleft:hover > button {
  animation: backOutLeft $duration;
}

.backoutright:hover > button {
  animation: backOutRight $duration;
}

.backoutup:hover > button {
  animation: backOutUp $duration;
}

.fadeout:hover > button {
  animation: fadeOut $duration;
}

.fadeoutdown:hover > button {
  animation: fadeOutDown $duration;
}

.fadeoutdownbig:hover > button {
  animation: fadeOutDownBig $duration;
}

.fadeoutleft:hover > button {
  animation: fadeOutLeft $duration;
}

.fadeoutleftbig:hover > button {
  animation: fadeOutLeftBig $duration;
}

.fadeoutright:hover > button {
  animation: fadeOutRight $duration;
}

.fadeoutrightbig:hover > button {
  animation: fadeOutRightBig $duration;
}

.fadeoutup:hover > button {
  animation: fadeOutUp $duration;
}

.fadeoutupbig:hover > button {
  animation: fadeOutUpBig $duration;
}

.fadeouttopleft:hover > button {
  animation: fadeOutTopLeft $duration;
}

.fadeouttopright:hover > button {
  animation: fadeOutTopRight $duration;
}

.fadeoutbottomright:hover > button {
  animation: fadeOutBottomRight $duration;
}

.fadeoutbottomleft:hover > button {
  animation: fadeOutBottomLeft $duration;
}

.flipoutX:hover > button {
  animation: flipOutX $duration;
}

.flipoutY:hover > button {
  animation: flipOutY $duration;
}

.lightspeedoutright:hover > button {
  animation: lightSpeedOutRight $duration;
}

.lightspeedoutleft:hover > button {
  animation: lightSpeedOutLeft $duration;
}

.rotateout:hover > button {
  animation: rotateOut $duration;
}

.rotateoutdownleft:hover > button {
  animation: rotateOutDownLeft $duration;
}

.rotateoutdownright:hover > button {
  animation: rotateOutDownRight $duration;
}

.rotateoutupleft:hover > button {
  animation: rotateOutUpLeft $duration;
}

.rotateoutupright:hover > button {
  animation: rotateOutUpRight $duration;
}

.rollout:hover > button {
  animation: rollOut $duration;
}

.zoomout:hover > button {
  animation: zoomOut $duration;
}

.zoomoutdown:hover > button {
  animation: zoomOutDown $duration linear;
}

.zoomoutleft:hover > button {
  animation: zoomOutLeft $duration linear;
}

.zoomoutright:hover > button {
  animation: zoomOutRight $duration linear;
}

.zoomoutup:hover > button {
  animation: zoomOutUp $duration linear;
}
!

JS 

              
                /* created with help from https://animate.style/  ❤️ */
!
999px

Console