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HTML

CSS

CSS Base

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HTML

              
                h1 animation direction
ul
  li
    label normal
    .cell
      .c.directiom-normal(data-col="1")
  li
    label reverse
    .cell
      .c.directiom-reverse(data-col="2")
  li
    label alternate
    .cell
      .c.directiom-alternate(data-col="3")
  li
    label alternate-reverse
    .cell
      .c.directiom-alternate-reverse(data-col="4")
              
            
!

CSS

              
                @import 'nib';
@keyframes move
  0%   { left: 0 }
  100% { left: calc(100% - 2em) }

.c
  position: absolute
  top: 0
  animation move 5s ease 0s infinite

.directiom-normal
  animation-direction: normal
.directiom-reverse
  animation-direction: reverse
.directiom-alternate
  animation-direction: alternate
.directiom-alternate-reverse
  animation-direction: alternate-reverse

html
  font-size: 100%
h1
  font-size: 2.4rem
  text-align: center
ul
  list-style: none
  margin: 2em auto 0
  padding: 0
  max-width: 760px
li
  display: flex
  flex-direction: row
  justify-content: flex-start
  align-items: center
  padding: .5em 1em
  border-bottom: 1px solid #AAB2BD
  width: 100%
  box-sizing: border-box
  &:first-child
    border-top: 1px solid #AAB2BD
.cell
  position: relative
  flex: 1
  height: 2em
label
  font-size: 83%
  white-space: nowrap
  padding-right: .5em
  width: 9em
.c
  border-radius: 50%
  width: 2em
  height: 2em
  
colors = {
  '1': #A0D468,
  '2': #FFCE54,
  '3': #4FC1E9,
  '4': #E9573F,
}
for key, value in colors
  .c[data-col=\"{key}\"]
    background-color: value
              
            
!

JS

              
                
              
            
!
999px

Console