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HTML

              
                h1
 | How a CSS Diamond is Made

#whole-thing
  .steps
    .step-0
      | Imagine a box.
    .step-1
      | The box has the Cage.
    .step-2
      | The box rotates 45 degrees.
    .step-3
      | The Cage rotates -45 degrees.
    .step-4
      | The Cage zooms himself to fill gaps.
    .step-5
      | Bring up the Cage.
    .step-6
      | The box hides overflow parts.
    .step-8
      | The End.
      
  .diamond
    img(src='http://placecage.com/240/240')
 
  .triangle-title
    button#re-run
      | Run Again
  
  .inspiredby
    | Inspired by 
    a(href='https://codepen.io/chriscoyier/pen/lotjh')
      | Animation to Explain CSS Triangles
      
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Andika);

$stepTiming: 0.8s 0.2s;

.diamond {
  overflow: visible;
  margin: auto;
  width: 180px; /* option */
  height: 180px; /* option */
  outline: 2px solid blue;
  background-color: rgba(200,200,200,0.5);
  transition: $stepTiming;
  img {
    width: 100%;
    height: auto;
    opacity: 0;
    outline: 2px solid red;
    transition: $stepTiming;
  }
  .step-1 & {
    opacity: 0.5;
    img {
      opacity: 0.5;
    }
  }
  .step-2 & {
    transform: rotate(45deg);
  }
  .step-3 & {
    img {
      transform: rotate(-45deg);
    }
  }
  .step-4 & {
    img {
      width: 150%;
    }
  }
  .step-5 & {
    img {
      margin: -25%;
    }
  }
  .step-6 & {
    overflow: hidden;
  }
  .step-7 & {
    outline-color: rgba(0,0,0,0);
    img {
      opacity: 1;
      outline-color: rgba(0,0,0,0);
    }
  }
}

.triangle-title {
  width: 300px;
  padding: 1rem;
  color: white;
  border-radius: 20px;
  margin: 50px auto;
  opacity: 0;
  transition: $stepTiming;
  .step-8 & {
    opacity: 1;
  }
}

body {
  background: #333;
  font-family: 'Andika', sans-serif;
  color: white;
  text-align: center;
  font-size: large;
  transform: translateZ(0);
}

.steps {
  position: relative;
  margin-bottom: 50px;
  height: 45px;
  > div {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    opacity: 0;
    background: #333;
    transition: 0.3s;
  }
  .step-0 {
    opacity: 1; 
  }
  .step-1 & .step-1 {
    opacity: 1; 
  }
  .step-2 & .step-2 {
    opacity: 1; 
  }
  .step-3 & .step-3 {
    opacity: 1; 
  }
  .step-4 & .step-4 {
    opacity: 1; 
  }
  .step-5 & .step-5 {
    opacity: 1; 
  }
  .step-6 & .step-6 {
    opacity: 1; 
  }
  .step-7 & .step-7 {
    opacity: 1; 
  }
  .step-8 & .step-8 {
    opacity: 1; 
  }
}

h1 {
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 1.5rem;
  border-bottom: 1px solid #555;
  color: #999;
}

.inspiredby a {
  color: #FFF;
}
              
            
!

JS

              
                demo = $("#whole-thing")

run = () ->
  
  setTimeout ->
    demo.addClass("step-1")
  , 2500

  setTimeout ->
    demo.addClass("step-2")
  , 5000
  
  setTimeout ->
    demo.addClass("step-3")
  , 7500
  
  setTimeout ->
    demo.addClass("step-4")
  , 10000
  
  setTimeout ->
    demo.addClass("step-5")
  , 12500
  
  setTimeout ->
    demo.addClass("step-6")
  , 15000
  
  setTimeout ->
    demo.addClass("step-7")
  , 16000
  
  setTimeout ->
    demo.addClass("step-8")
  , 17500
  
run()

$("#re-run").on 'click', ->
  $("#whole-thing").removeClass()
  run()
  
              
            
!
999px

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