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              %main{:rel => 'main'}
  %ul{:role => 'presentation'}
    -(1..4).each do
      %li
  %button
%p.credit 
  Designed by 
  %a{:href => 'https://dribbble.com/bendunn'}Ben Dunn 
  and coded by 
  %a{:href => 'https://codepen.io/Michiel/'}Michiel Bijl
            
          
!
            
              // Some vars
$animation-duration: 2.5s;

$background-color:  #5978fb;
$window-top:        #3c3e99;
$window-bar:        #4c54a4;
$window-content:    #fff;
$window-background: #474baf;

$button-color:      #dee0e4;
$button-size: 32px;

$window-width: 190px;
$window-height: 320px;

$header-height: 45px;

$article-height: ($window-height - $header-height);

main {
  // we need to reserve some space fot this to work.
  position: relative;
  width: ($window-width * 3);
  height: $window-height;
}

// Card
ul {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: 0;
  padding: 0;
  list-style: none;
  width: $window-width;
  height: $window-height;
  background-color: $window-background;
  transform: translate(-50%, -50%);
  will-change: transform, opacity, right;
  
  > * {
    position: absolute;
  }
}

li {
  top: $header-height;
  right: 0;
  width: $window-width;
  height: $article-height;
  box-shadow: 0 2px 4px rgba(50,50,50,0.3);
  background-color: $window-content;
  //animation: article forwards $animation-duration infinite;
  transform-origin: 50% 50%;
  
  &:nth-child(1) {
    right: 100%;
    z-index: 50;
    transform: scale(.8);
    opacity: .3;
    animation: article-one forwards $animation-duration infinite;
  }
  
  &:nth-child(2) {
    right: 0;
    z-index: 50;
    animation: article-two forwards $animation-duration infinite;
  }
  
  &:nth-child(3) {
    right: 0;
    z-index: 45;
    transform-origin: 100% 50%;
    transform: scale(.8);
    animation: article-three forwards $animation-duration infinite;
  }
  
  &:nth-child(4) {
    right: 0;
    z-index: 40px;
    transform-origin: 100% 50%;
    transform: scale(.7);
    opacity: .3;
    animation: article-four forwards $animation-duration infinite;
  }
}

button {
  position: absolute;
  bottom: 45px;
  right: ($window-width - 25 - $button-size);
  
  margin: 0;
  padding: 0;
  width: $button-size;
  height: $button-size;
  border: 0;
  border-radius: 100%;
  -webkit-appearance: none;
  background-color: $button-color;
  animation: button forwards $animation-duration infinite;
}

// Animations
@keyframes button {
  0%, 20% {
    bottom: 45px;
    right: ($window-width - 25 - $button-size);
    transform: scale(1);
  }
  35% {
    bottom: 90px;
    right: ($window-width + 35px);
    transform: scale(1);
  }
  50% {
    bottom: 90px;
    right: ($window-width + 35px);
    transform: scale(.5625);
  }
  65%, 85% {
    bottom: 90px;
    right: (($window-width * 2) - 30px);
    transform: scale(.5625);
  }
}

@keyframes article-one {
  0%, 50% {
    right: 100%;
    transform: scale(.8);
    opacity: .3;
  }
  50% {
    right: 100%;
    transform: scale(.8);
    opacity: .3;
  }
  65%, 100% {
    transform: scale(.8);
    right: 250%;
    opacity: 0;
  }
}

@keyframes article-two {
  0%, 40% {
    right: 0;
    transform: scale(1);
    opacity: 1;
  }
  50% {
    right: 0;
    transform: scale(.8);
    opacity: 1;
  }
  65%, 100% {
    transform: scale(.8);
    right: 100%;
    opacity: .3;
  }
}

@keyframes article-three {
  0%, 40% {
    right: 0;
    transform: scale(0.8);
  }
  50% {
    right: 0;
    transform: scale(0.7);
  }
  65%, 100% {
    right: 0;
    transform: scale(1);
  }
}

@keyframes article-four {
  0%, 40% {
    right: 0;
    transform-origin: 100% 50%;
    transform: scale(.7);
    opacity: .3;
  }
  50% {
    right: -20px;
    transform-origin: 100% 50%;
    transform: scale(.6);
    opacity: .3;
  }
  65%, 85% {
    right: 0;
    transform-origin: 100% 50%;
    transform: scale(.7);
    opacity: .3;
  }
}

// Unimportant bits
* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: $background-color;
}

.credit {
  display: none;
  position: fixed;
  right: 20px;
  bottom: 20px;
  margin: 0;
  color: #fff;
  font-size: 14px;
  font-family: Avenir Next, Helvetica Neue, sans-serif;
  
  // The CodePen preview/thumbnail window is 300px in height
  @media (min-height: 350px) {
    display: block;
  }
  
  a {
    display: inline-block;
    color: #fff;
    text-decoration: none;
    border-bottom: 1px dashed rgba(255,255,255,.3);
    transition: border-color ease-out .15s;
  
    &:focus,
    &:hover {
      border-bottom-color: #fff;
    }
  }
}
            
          
!
            
              // based on this Dribbble: https://dribbble.com/shots/1721120-Keynote-animation-recreation
            
          
!
999px
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