bulma/sass/elements/progress.sass

$progress-height: var(--size-normal, #{$size-normal}) !default

$progress-bar-background-color: var(--border-light, #{$border-light}) !default
$progress-value-background-color: var(--text, #{$text}) !default
$progress-border-radius: var(--radius-rounded, #{$radius-rounded}) !default

$progress-indeterminate-duration: 1.5s !default

$progress-colors: $colors !default

.progress
  --progress-border-radius: #{$progress-border-radius}
  --progress-bar-background-color: #{$progress-bar-background-color}
  --progress-height: #{$progress-height}
  --progress-value-background-color: #{$progress-value-background-color}
  --progress-indeterminate-duration: #{$progress-indeterminate-duration}

  @extend %block
  -moz-appearance: none
  -webkit-appearance: none
  border: none
  border-radius: var(--progress-border-radius)
  display: block
  height: var(--progress-height)
  overflow: hidden
  padding: 0
  width: 100%
  &::-webkit-progress-bar
    background-color: var(--progress-bar-background-color)
  &::-webkit-progress-value
    background-color: var(--progress-value-background-color)
  &::-moz-progress-bar
    background-color: var(--progress-value-background-color)
  &::-ms-fill
    background-color: var(--progress-value-background-color)
    border: none
  // Colors
  @each $name, $pair in $progress-colors
    $color: nth($pair, 1)
    &.is-#{$name}
      &::-webkit-progress-value
        --progress-value-background-color: var(--#{$name}, #{$color})
      &::-moz-progress-bar
        --progress-value-background-color: var(--#{$name}, #{$color})
      &::-ms-fill
        --progress-value-background-color: var(--#{$name}, #{$color})
      &:indeterminate
        background-image: linear-gradient(to right, var(--#{$name}, #{$color}) 30%, var(--progress-bar-background-color) 30%)

  &:indeterminate
    animation-duration: var(--progress-indeterminate-duration)
    animation-iteration-count: infinite
    animation-name: moveIndeterminate
    animation-timing-function: linear
    background-color: var(--progress-bar-background-color)
    background-image: linear-gradient(to right, var(--text, #{$text}) 30%, var(--progress-bar-background-color) 30%)
    background-position: top left
    background-repeat: no-repeat
    background-size: 150% 150%
    &::-webkit-progress-bar
      background-color: transparent
    &::-moz-progress-bar
      background-color: transparent
    &::-ms-fill
      animation-name: none

  // Sizes
  &.is-small
    --progress-height: var(--size-small, #{$size-small})
  &.is-medium
    --progress-height: var(--size-medium, #{$size-medium})
  &.is-large
    --progress-height: var(--size-large, #{$size-large})

@keyframes moveIndeterminate
  from
    background-position: 200% 0
  to
    background-position: -200% 0