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              <!-- Many thanks to https://github.com/andrefarzat for his work on the loading bars! -->
<div class="container">
  <div id="plotly-button" class="button">

    <div class="plotlybars-wrapper">
      <div class="plotlybars">
        <div class="plotlybars-bar b1"></div>
        <div class="plotlybars-bar b2"></div>
        <div class="plotlybars-bar b3"></div>
        <div class="plotlybars-bar b4"></div>
        <div class="plotlybars-bar b5"></div>
        <div class="plotlybars-bar b6"></div>
        <div class="plotlybars-bar b7"></div>
      </div>
    </div>

    <div class="text">
      load more
    </div>
  </div>
</div>

<footer>
  made with <span class="h">♡</span> for 
  <a href="https://plot.ly" target="_blank">plotly</a>
</footer>
            
          
!
            
              $blue: #447adb;
$font: 'Open Sans', verdana, arial, sans-serif;
$width: 85px;
$height: 0.4*$width;
$padding-h: 40px;
$padding-v: 20px;

.button {
  border: solid 3px $blue;
  display: inline-block;
  padding: 20px 40px;
  margin: 0 auto;
  cursor: pointer;
  text-transform: uppercase;
  color: $blue;
  transition: all 0.2s ease-in-out,
    background-color 0.05s,
    color 0.05s;
  
  font-size: 0.95rem;
  
  &:hover {
    background-color: $blue;
    color: white;
  }

  .text {
    line-height: $height;
  }
  
  .plotlybars-wrapper {
    display: none;
    transform: rotate(-180deg);
  }
}

.button.pending {
  border-radius: 50%;
  height: $width;
  padding: $padding-h;
  transform: rotate(180deg);
  background-color: $blue;
  cursor: auto;
  
  .plotlybars-bar {
    background-color: white;
  }
  
  .text {
    opacity: 0;
    display: none;
  }
  
  .plotlybars-wrapper {
    display: block;
  }
}

.plotlybars {
  padding: 0 10px;
  vertical-align: bottom;

  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
  box-sizing: border-box;
}

.plotlybars-wrapper {
  position: relative;
  width: $width;
  height: $height;
  padding-bottom: $height/2;
}

.plotlybars-bar {
  background-color: $blue;
  height: 100%;
  width: 12%;
  position: absolute;
  
  -webkit-transform: translateZ(0);
  transform: translateZ(0);

  animation-duration: 1.5s;
  animation-iteration-count: infinite;
  animation-direction: normal;
  animation-timing-function: linear;

  -webkit-animation-duration: 1.5s;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-direction: normal;
  -webkit-animation-timing-function: linear;
}


.b1 { left: 0%; top: 88%; animation-name: b1; -webkit-animation-name: b1; }
.b2 { left: 14.3%; top: 76%; animation-name: b2; -webkit-animation-name: b2; }
.b3 { left: 28.6%; top: 16%; animation-name: b3; -webkit-animation-name: b3; }
.b4 { left: 42.9%; top: 40%; animation-name: b4; -webkit-animation-name: b4; }
.b5 { left: 57.2%; top: 26%; animation-name: b5; -webkit-animation-name: b5; }
.b6 { left: 71.5%; top: 67%; animation-name: b6; -webkit-animation-name: b6; }
.b7 { left: 85.8%; top: 89%; animation-name: b7; -webkit-animation-name: b7; }

@keyframes b1 { 0% { top: 88%; } 44% { top: 0%; } 94% { top: 100%; } 100% { top: 88%; } }
@-webkit-keyframes b1 { 0% { top: 88%; } 44% { top: 0%; } 94% { top: 100%; } 100% { top: 88%; } }

@keyframes b2 { 0% { top: 76%; } 38% { top: 0%; } 88% { top: 100%; } 100% { top: 76%; } }
@-webkit-keyframes b2 { 0% { top: 76%; } 38% { top: 0%; } 88% { top: 100%; } 100% { top: 76%; } }

@keyframes b3 { 0% { top: 16%; } 8% { top: 0%; } 58% { top: 100%; } 100% { top: 16%; } }
@-webkit-keyframes b3 { 0% { top: 16%; } 8% { top: 0%; } 58% { top: 100%; } 100% { top: 16%; } }

@keyframes b4 { 0% { top: 40%; } 20% { top: 0%; } 70% { top: 100%; } 100% { top: 40%; } }
@-webkit-keyframes b4 { 0% { top: 40%; } 20% { top: 0%; } 70% { top: 100%; } 100% { top: 40%; } }

@keyframes b5 { 0% { top: 26%; } 13% { top: 0%; } 63% { top: 100%; } 100% { top: 26%; } }
@-webkit-keyframes b5 { 0% { top: 26%; } 13% { top: 0%; } 63% { top: 100%; } 100% { top: 26%; } }

@keyframes b6 { 0% { top: 67%; } 33.5% { top: 0%; } 83% { top: 100%; } 100% { top: 67%; } }
@-webkit-keyframes b6 { 0% { top: 67%; } 33.5% { top: 0%; } 83% { top: 100%; } 100% { top: 67%; } }

@keyframes b7 { 0% { top: 89%; } 44.5% { top: 0%; } 94.5% { top: 100%; } 100% { top: 89%; } }
@-webkit-keyframes b7 { 0% { top: 89%; } 44.5% { top: 0%; } 94.5% { top: 100%; } 100% { top: 89%; } }

html, body, .container {
  margin: 0;
  height: 100%;
  font-family: $font;
}

.container {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;  
  align-items: center;
}

footer {
  position: absolute;
  bottom: 0;
  padding: 20px;
  width: 100%;
  text-align: center;
  box-sizing: border-box;
  font-size: 0.8rem;
  opacity: 0.5;
  transition: all 0.2s;
   font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; 
   font-weight: 300;
  
  .h { 
    color: #E4287C;
  }
  
  &:hover {
    opacity: 1;
  }
  
  a {
    color: $blue;
    text-decoration: none;
    font-weight: bold;
    
    &:hover {
      text-decoration: underline;
    }
  }
}
            
          
!
            
              let activeClass = "pending";
let el = document.getElementById("plotly-button");

function toggle(e) {
  if (e.keyCode && e.keyCode !== 69) return;
  el.classList.toggle(activeClass);
}

el.addEventListener("click", toggle);
document.addEventListener("keydown", toggle, false);
            
          
!
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