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CSS

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JavaScript

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HTML 

              
                main(role="main")
  // An unordered list is completely useless here, 
  // but I like to use it for repeating elements.
  ul(role="progressbar", aria-busy="true", aria-label="Loading domino shop")
    li(role="presentation")
    li(role="presentation")
    li(role="presentation")
    li(role="presentation")
    li(role="presentation")
    li(role="presentation")
    li(role="presentation")
  p Designed by 
    a(href="https://dribbble.com/colder") Vitalijs Silkin 
    |  and coded by 
    a(href="https://codepen.io/Moiety/") Zoë Bijl
!

CSS 

              
                $background-colour: #1a6aaf
$text-colour: #fff

// Bar Settings
$bar-colour: $text-colour
$bar-animation-duration: 2.8s

// These are not to be adjusted; it would mess 
// with the angles. If anyone knows how to make 
// the angles dynamic. I'd love to hear it.
$bar-width: 3px
$bar-height: 25px
$bar-count: 7

// Generated settings
$bar-animation-duration-single: -($bar-animation-duration / $bar-count)

[role="progressbar"]
  position: relative
  padding: 0
  width: 100px
  height: $bar-height
  list-style: none
  
  li
    display: block
    position: absolute
    right: 0
    width: $bar-width
    height: $bar-height
    border-radius: 1px
    // Rotate from the middle of the bottom
    transform-origin: 50% 100%
    background-color: $bar-colour
    animation: bar linear $bar-animation-duration infinite
    // Tell the browser which properties will change in the animation
    will-change: transform
    
    // Set default states for browsers that don't support animations
    &:nth-child(1)
      transform: translateX(0) rotate(0deg)
      opacity: .2
    &:nth-child(2)
      transform: translateX(-15px) rotate(0deg)
      animation-delay: $bar-animation-duration-single
    &:nth-child(3)
      transform: translateX(-30px) rotate(0deg)
      animation-delay: ($bar-animation-duration-single * 2)
    &:nth-child(4)
      transform: translateX(-45px) rotate(10deg)
      animation-delay: ($bar-animation-duration-single * 3)
    &:nth-child(5)
      transform: translateX(-60px) rotate(40deg)
      animation-delay: ($bar-animation-duration-single * 4)
    &:nth-child(6)
      transform: translateX(-75px) rotate(62deg)
      animation-delay: ($bar-animation-duration-single * 5)
    &:nth-child(7)
      transform: translateX(-90px) rotate(72deg)
      animation-delay: ($bar-animation-duration-single * 6)
    
@keyframes bar
  0%
    transform: translateX(0) rotate(0deg)
    opacity: 0
  14.28%
    transform: translateX(-15px) rotate(0deg)
    opacity: 1
  28.56%
    transform: translateX(-30px) rotate(0deg)
    opacity: 1
  37.12%
    transform: translateX(-39px) rotate(0deg)
    opacity: 1
  42.84%
    transform: translateX(-45px) rotate(10deg)
    opacity: 1
  57.12%
    transform: translateX(-60px) rotate(40deg)
    opacity: 1
  71.4%
    transform: translateX(-75px) rotate(62deg)
    opacity: 1
  85.68%
    transform: translateX(-90px) rotate(72deg)
    opacity: 1
  100%
    transform: translateX(-105px) rotate(74deg)
    opacity: 0

// unimportant bits
html,
body
  margin: 0
  padding: 0
  height: 100%

body
  display: flex
  align-items: center
  justify-content: center
  -webkit-font-smoothing: antialiased
  background-color: $background-colour

a
  display: inline-block
  color: $text-colour
  text-decoration: none
  border-bottom: 1px dashed rgba(255,255,255,.3)
  transition: border-color ease-out .15s
  
  &:focus,
  &:hover
    border-bottom-color: $text-colour

p
  margin-top: 40px
  color: $text-colour
  font-size: 14px
  font-family: Avenir Next, Helvetica Neue, Helvetica, sans-serif

[role="progressbar"]
  margin: 0 auto
!

JS 

              
                // https://dribbble.com/shots/1684214-Domino-effect-loader?list=219798-Loaders
!
999px

Console