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CSS

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HTML 

              
                button.submit
  span Submit
!

CSS 

              
                // DOCUMENT  -----------

html, body
  height: 100%

body
  display: flex
  justify-content: center
  align-items: center

// SUBMIT  -----------

.submit
  width: 380px
  height: 120px
  background: #fff
  padding: 10px 45px
  border: 4px solid #19CC95
  border-radius: 60px
  cursor: pointer
  outline: none
  transition: all 250ms
  
  > span
    color: #19CC95
    letter-spacing: 2px
    font-size: 31px
    font-weight: bold
    font-family: 'Noto Sans', sans-serif
    transition: all 250ms
  
  &:disabled
    cursor: not-allowed
  
  &:hover
    background: #19CC95
    
    > span
      color: #fff
      font-size: 33px
    
  &:active
  
    > span
      font-size: 31px
      transition: none

// SUBMIT.LOADER -----------
    
.submit.loader
  background: #fff
  border: 7px solid #BBBBBB
  width: 125px
  padding: 0
  color: #fff
  font-size: 0
  
  > span
    opacity: 0
    font-size: 0

// SUBMIT.LOADING  -----------

.submit.loading
  cursor: wait
  position: relative
  
  &:before
    content: ''
    position: absolute
    top: -7px
    left: -7px
    height: 100%
    width: 100%
    border: 7px solid #19CC95
    border-radius: 60px

// SUBMIT.SUCCESS  -----------
  
.submit.success
  background: #19CC95
  
  > span
    display: inline-block
    position:relative
    width: 50px
    height: 50px
    opacity: 0
    font-size: 0
    overflow: hidden
    line-height: 150px
    animation: showSuccess 400ms 100ms forwards ease-in
    @keyframes showSuccess
      from
        transform: scale(0.8)
        opacity: 0 
      to
        transform: scale(1)
        opacity: 1
    
    &:before, &:after
      content: ''
      display: block
      position: absolute
      background: #fff
    
    &:before
      width: 25px
      height: 8px
      bottom: 9px
      left: 0
      transform: rotate(38deg)
      border-radius: 10px 0 15px 10px
    
    &:after
      width: 45px
      height: 8px
      top: 19px
      right: -7px
      transform: rotate(129deg)
      border-radius: 10px 0 0 10px
    
// ANIMATION LOOP ----

$counter: 0

@for $i from 0 through 100
  
  @if $counter % 13 == 0
    $counter: 0
  
  @if $i >= 0 and $i <= 12
    $nbr:  (50 + (4.16666666 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, $nbr 0%, 50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%)
    
  @if $i >= 13 and $i <= 25
    $nbr:  (0 + (4.16666666 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, 100% 0%, 100% $nbr, 50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%)
    
  @if $i >= 26 and $i <= 38
    $nbr:  (50 + (4.16666666 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, 100% 0%, 100% 50%, 100% $nbr, 50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%)
    
  @if $i >= 39 and $i <= 51
    $nbr:  (100 - (4.16666666 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, 100% 0%, 100% 50%, 100% 100%, 50% 100%, $nbr 100%, 50% 50%, 50% 50%, 50% 50%)
    
  @if $i >= 52 and $i <= 64
    $nbr:  (50 - (4.16666666 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, 100% 0%, 100% 50%, 100% 100%, 50% 100%, $nbr 100%, 50% 50%, 50% 50%, 50% 50%)
    
  @if $i >= 65 and $i <= 77
    $nbr:  (100 - (4.16666666 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, 100% 0%, 100% 50%, 100% 100%, 50% 100%, 0% 100%, 0% $nbr, 50% 50%, 50% 50%)
    
  @if $i >= 78 and $i <= 90
    $nbr:  (50 - (4.16666666 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, 100% 0%, 100% 50%, 100% 100%, 50% 100%, 0% 100%, 0% 50%, 0% $nbr, 50% 50%)
    
  @if $i >= 91 and $i <= 100
    $nbr:  (0 + (5.55555555 * $counter)) * 1%
    .submit.loading[data-percent="#{$i}"]:before
      clip-path: polygon(50% 50%, 50% 0, 100% 0%, 100% 50%, 100% 100%, 50% 100%, 0% 100%, 0% 50%, 0% 0%, $nbr 0%)
       
  $counter: $counter + 1
!

JS 

              
                var fakeProgress = function() {
  var $btn = $('.submit'),
    percent = ($btn.attr('data-percent')) ? Number($btn.attr('data-percent')) + 1 : 0;
  if (percent >= 0 && percent <= 100) {
    $btn.attr('data-percent', percent);
  } else {
    $btn
      .removeAttr('data-percent')
      .removeClass('loader loading')
      .addClass('success');
    clearInterval(progress);
  }
}

$('.submit:not(disabled)').click(function() {
  $(this)
    .prop('disabled', true)
    .addClass('loader')
    .on('transitionend', function() {
      progress = setInterval(fakeProgress, 10);
      $(this)
        .addClass('loading')
        .off('transitionend');
    });
});
!
999px

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