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HTML

              
                .container
  .loader
    .loader--dot
    .loader--dot
    .loader--dot
    .loader--dot
    .loader--dot
    .loader--dot
    .loader--text
    
              
            
!

CSS

              
                $loader--width: 250px
$loader-dot--size: 20px

.container
  height: 100vh
  width: 100vw
  font-family: Helvetica

.loader
  height: $loader-dot--size
  width: $loader--width
  position: absolute
  top: 0
  bottom: 0
  left: 0
  right: 0
  margin: auto
  
  &--dot
    animation:
      name: loader
      timing-function: ease-in-out
      duration: 3s
      iteration-count: infinite
    height: $loader-dot--size 
    width: $loader-dot--size 
    border-radius: 100%
    background-color: black
    position: absolute
    border: 2px solid white
    
    &:first-child
      background-color: #8cc759
      animation-delay: 0.5s
    
    &:nth-child(2)
      background-color: #8c6daf
      animation-delay: 0.4s
    
    &:nth-child(3)
      background-color: #ef5d74
      animation-delay: 0.3s
    
    &:nth-child(4)
      background-color: #f9a74b
      animation-delay: 0.2s
    
    &:nth-child(5)
      background-color: #60beeb
      animation-delay: 0.1s
    
    &:nth-child(6)
      background-color: #fbef5a
      animation-delay: 0s
  
  &--text
    position: absolute
    top: 200%
    left: 0
    right: 0
    width: 4rem
    margin: auto

    &:after
      content: "Loading"      
      font-weight: bold
      animation:
        name: loading-text
        duration: 3s
        iteration-count: infinite
    
@keyframes loader
  15%
    transform: translateX(0)
  
  45%
    transform: translateX( $loader--width - $loader-dot--size )

  65%
    transform: translateX( $loader--width - $loader-dot--size )
  
  95%
    transform: translateX(0)

@keyframes loading-text
  0%
    content: "Loading"
  
  25%
    content: "Loading."
  
  50%
    content: "Loading.."
  
  75%
    content: "Loading..."
              
            
!

JS

              
                
              
            
!
999px

Console