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HTML

              
                <!-- SVG templates -->
<!-- Would have used <use> but it's tricky to style and trasition Shadow DOM elements -->

<svg class="svg--template loader">
  <circle class="circle1" stroke="none" stroke-width="4" fill="none" r="25" cx="25" cy="25"/>
</svg>
<svg class="svg--template checkmark" viewBox="0 0 50 50">
  <g class="checkmark1">
    <path class="line1" d="M20.8,36l-4,4c-0.7,0.7-1.7,0.7-2.4,0L0.8,26.4c-0.7-0.7-0.7-1.7,0-2.4l4-4c0.7-0.7,1.7-0.7,2.4,0l13.6,13.6
    C21.5,34.3,21.5,35.4,20.8,36z"/>
  <path class="line2" d="M14.5,39.9l-4-4c-0.7-0.7-0.7-1.7,0-2.4L43.4,0.6c0.7-0.7,1.7-0.7,2.4,0l4,4c0.7,0.7,0.7,1.7,0,2.4L16.9,39.9
    C16.3,40.6,15.2,40.6,14.5,39.9z"/>
  </g>
</svg>

<svg class="svg--template" viewBox="0 0 304 305" version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg">
  <symbol id="shadow--logo-dribbble">
		<path id="SVGID_1_" d="M152,298.2C73,298.2,8.7,234,8.7,155.1C8.7,76.2,73,12,152,12c79,0,143.3,64.2,143.3,143.1
			C295.3,234,231,298.2,152,298.2L152,298.2z M272.8,174.7c-4.2-1.3-37.9-11.4-76.2-5.2c16,43.9,22.5,79.7,23.8,87.1
			C247.8,238.1,267.4,208.7,272.8,174.7L272.8,174.7z M199.8,267.8c-1.8-10.7-8.9-48.1-26.1-92.7c-0.3,0.1-0.5,0.2-0.8,0.3
			c-69,24-93.8,71.8-96,76.3c20.8,16.2,46.8,25.8,75.1,25.8C168.9,277.5,185.1,274.1,199.8,267.8L199.8,267.8z M61.1,237
			c2.8-4.7,36.4-60.3,99.5-80.7c1.6-0.5,3.2-1,4.8-1.5c-3.1-6.9-6.4-13.9-9.9-20.7C94.3,152.4,35,151.7,29.7,151.6
			c0,1.2-0.1,2.5-0.1,3.7C29.6,186.7,41.5,215.4,61.1,237L61.1,237z M32.2,130.3c5.5,0.1,55.9,0.3,113.1-14.9
			c-20.3-36-42.1-66.3-45.4-70.7C65.7,60.8,40.1,92.3,32.2,130.3L32.2,130.3z M123.3,36.5c3.4,4.5,25.6,34.8,45.7,71.5
			c43.5-16.3,61.9-41,64.1-44.1c-21.6-19.1-50-30.8-81.1-30.8C142.1,33.1,132.5,34.3,123.3,36.5L123.3,36.5z M246.7,78
			c-2.6,3.5-23.1,29.7-68.3,48.2c2.8,5.8,5.6,11.7,8.1,17.7c0.9,2.1,1.8,4.2,2.6,6.3c40.7-5.1,81.2,3.1,85.2,3.9
			C274.1,125.3,263.8,98.8,246.7,78L246.7,78z"/>
  </symbol>
</svg>

<div class="side-note"><span>A pen by</span><a href='https://codepen.io/guywald/' target='_blank'>Guy Waldman</a></div>

<div id="browserAlert" style="display: none"><span></span></div>

<!-- --------------------------------------------------------------------------- -->

<header>
  <svg id="logo-dribbble" viewBox="0 0 304 305" width="150" height="150">
   <use xlink:href="#shadow--logo-dribbble"></use>
</svg>
  <div class="header--text"><span>Inspired by: </span><a href="https://dribbble.com/shots/1426764-Submit-Button" target="_blank">Colin Garven</a></div>
</header>

<main>
  <!-- button -->
  <button class="btnSubmit">Submit</button>
</main>
              
            
!

CSS

              
                // WEB FONT --------------------------------------------------------------

@import 'https://fonts.googleapis.com/css?family=Roboto:300,500,700'

// VARIABLES (customize if you want) ------------------------------------

$bgColor: #fafafa
$shadow: rgba(lighten($bgColor, 10%),.2)
$accentColor: #1ECD97
$secondaryColor: #C5C5C5
$btnWidth: 175px
$btnHeight: 50px // Firefox users - don't touch!
$borderRadius: 35px
$btnBorder: 2px
$loaderStroke: 3px
$dribbble: #ea4c89

// MAIN STYLES ---------------------------------------------------------

// body & header --------------------------------------------------------

body
  display: flex
  align-items: center
  justify-content: center
  flex-direction: column
  height: 100vh
  widht: 100vw
  overflow: hidden
  background: $bgColor
  font-family: 'Roboto', sans-serif
  font-weight: 400
  font-size: 14px
  font-smooth: auto
  -webkit-font-smoothing: antialiased
  
header
  position: absolute
  top: 30px
  width: calc(30px + 15em)
  left: calc(50% - 15px - 7.5em)
  display: flex
  flex-flow: row nowrap
  align-items: center
  justify-content: space-around
  margin-bottom: 1em
  font-size: .8em
  .header--text
    letter-spacing: 1px
    span
      color: #777
      font-weight: 300
      margin-bottom: 0
    a
      display: inline-block
      margin-top: 0
      text-decoration: none
      font-weight: 700
      color: $dribbble
      transition: color 300ms ease
      &:hover
        color: lighten($dribbble, 10%)
  #logo-dribbble
    width: 2em
    height: auto
    fill: $dribbble
    transition: fill 300ms ease
    &:hover
      fill: lighten($dribbble, 10%)
    
// button ----------------------------------------------------------
  
button.btnSubmit
  
  // reset
  outline: none
  border: none
  cursor: default
  transition: box-shadow 300ms ease
  letter-spacing: 2px
  box-shadow: 0px 0px $btnHeight/2 10px $shadow
  user-select: none
  
  position: relative
  box-sizing: border-box
  width: $btnWidth
  height: $btnHeight
  border-radius: $borderRadius
  border: $btnBorder solid
  border-color: $accentColor
  background: none
  color: $accentColor
  transition: all 300ms ease-out
  &:hover
    cursor: pointer
    font-size: 1.05em
    border-color: transparent
    background: $accentColor
    color: $bgColor
  &.clicked
    pointer-events: none
    animation: anim1 200ms cubic-bezier(0.2, 0, 0.8, 1), anim2 300ms cubic-bezier(0.6, 0, 0.7, 1) 300ms 1 forwards
    &.done
      display: flex
      justify-content: center
      align-items: center
      width: $btnHeight
      background: $accentColor // fallback
      background: linear-gradient(0, $accentColor, lighten($accentColor, 5%))
      border-width: 0
      border-color: rgba($accentColor, 0)
      color: rgba($accentColor, 0)
      transition: all 1000ms ease
      animation: anim4 300ms cubic-bezier(0.2, 0, 0.4, 1) forwards

// svg -------------------------------------------------------------

svg.svg--template
  display: none

svg.loader
  position: absolute
  width: $btnHeight
  height: $btnHeight
  overflow: visible
  
svg
  &.loader
    position: absolute
    left: -($btnBorder)
    top: -($btnBorder)
    width: $btnHeight
    height: $btnHeight
  &.checkmark
    height: 1.2em
    width: 100%
  .circle1
    stroke: $accentColor
    stroke-width: $loaderStroke
    r: ($btnHeight - $loaderStroke)/2
    cx: ($btnHeight)/2
    cy: ($btnHeight)/2
    width: 100%
    height: 100%
    stroke-dasharray: $btnHeight*3.14
    transform: rotate(-90deg)
    transform-origin: 50% 50%
    animation: animLoading 2500ms cubic-bezier(0.6, 0, 0, 1)
  .checkmark1
    fill: $bgColor
    .line1
      transform-origin: 100% 100%
    .line2
      transform-origin: 0% 100%
    .line1, .line2
      animation: growAndRotate 500ms cubic-bezier(0.4, 0, 0, 1)
  
    
// animations ------------------------------------------------------------


@keyframes anim1
  0%
    font-size: 1.05em
  50%
    font-size: 0.9em
  100%
    font-size: 1.05emj

@keyframes anim2
  40%
    border-radius: $borderRadius
  20%, 100%
    color: rgba($accentColor, 0)
  100%
    background: none
    border-width: $btnBorder
    border-color: $secondaryColor
    border-radius: 50%
    padding: 0
    width: $btnHeight

@keyframes animLoading
  0%
    stroke-dashoffset: $btnHeight*3.14
  100%
    stroke-dashoffset: 0

@keyframes anim4
  0%
    border-radius: 50%
    width: $btnHeight
  40%
    border-radius: $borderRadius
  100%
    width: $btnWidth
  
@keyframes growAndRotate
  0%
    opacity: 0
    transform: scale(.4) rotate(-5deg)
  30%, 100%
    opacity: 1
  100%
    transform: scale(1) rotate(0)
  
// browser alert -------------------------------------------------
// (shows if user is on Edge/IE)

#browserAlert
  z-index: 10
  display: none
  left: 0
  top: 0
  position: absolute
  width: 100vw
  height: 100vh
  background: rgba(white, .8)
  pointer-events: none
  font-size: 2em
  &.active
    display: block
    span
      position: absolute
      left: 50%
      top: 50%
      transform: translate(-50%, -50%)
    
  
// side note -----------------------------------------------------

.side-note
  padding-top: 1em
  position: absolute
  display: flex
  justify-content: flex-start
  align-items: center
  flex-direction: column
  height: 10em
  min-width: 20em
  border-top: 2px solid darken($bgColor, 30%)
  background: white
  z-index: 10
  transform: rotate(-45deg)
  transform-origin: 100% 100%
  right: -8.5em
  bottom: 5em
  font-weight: 300
  font-size: .7em
  color: darken($bgColor, 30%)
  a
    color: darken($bgColor, 50%)
    margin-top: .3em
    cursor: default
    text-decoration: underline
    color: inherit
    font-weight: 500
    transition: color 300ms ease
    &:hover
      color: darken($bgColor, 60%)
              
            
!

JS

              
                /*
TESTED SUCCESFFULY ON: Chrome 52 / Firefox 48
DON'T VIEW ON: Edge
*/

$(function() {
  
  // check if browser is not supported
  var $browserAlert = $('#browserAlert');
  $browserAlert.hide();

  $.ajax({
    url: 'https://cdn.rawgit.com/arasatasaygin/is.js/master/is.min.js',
    dataType: "script",
    success: function() {

      if (is.edge() || is.ie()) {
        $browserAlert.find('span').text('View on Chrome/Firefox.');
        $browserAlert.show();
        $browserAlert.addClass('active');
      }

    }
  });

  var $btn = $("button.btnSubmit");
  var $loaderTemplate = $("svg.loader");
  var $checkmarkTemplate = $("svg.checkmark");

  $btn.on('click', function() {
    if ($(this).hasClass('clicked')) return;
    $(this).addClass('clicked');
    var self = $(this);
    var timeout1 = 600,
      timeout2 = 2500,
      timeout3 = 3000;
    setTimeout(function() {

      self.append($loaderTemplate.clone());
      self.find('svg').removeClass('svg--template');
      self.find('svg').css('display', 'initial');
    }, timeout1);
    setTimeout(function() {
      self.text('');
      self.find('svg').remove();
      self.append($checkmarkTemplate.clone());
      self.find('svg').css('display', 'initial');
      self.find('svg').removeClass('svg--template');
      self.addClass('done');
    }, timeout1 + timeout2);
    setTimeout(function() {
      self.find('svg').remove();
      self.text('Submit');
      self.removeClass('clicked');
      self.removeClass('done');
    }, timeout1 + timeout2 + timeout3);
  });

});
              
            
!
999px

Console