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_sass/vendor/bulma/sass/elements/progress.sass

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+$progress-bar-background-color: $border !default
+$progress-value-background-color: $text !default
+$progress-border-radius: $radius-rounded !default
+
+$progress-indeterminate-duration: 1.5s !default
+
+.progress
+  @extend %block
+  -moz-appearance: none
+  -webkit-appearance: none
+  border: none
+  border-radius: $progress-border-radius
+  display: block
+  height: $size-normal
+  overflow: hidden
+  padding: 0
+  width: 100%
+  &::-webkit-progress-bar
+    background-color: $progress-bar-background-color
+  &::-webkit-progress-value
+    background-color: $progress-value-background-color
+  &::-moz-progress-bar
+    background-color: $progress-value-background-color
+  &::-ms-fill
+    background-color: $progress-value-background-color
+    border: none
+  // Colors
+  @each $name, $pair in $colors
+    $color: nth($pair, 1)
+    &.is-#{$name}
+      &::-webkit-progress-value
+        background-color: $color
+      &::-moz-progress-bar
+        background-color: $color
+      &::-ms-fill
+        background-color: $color
+      &:indeterminate
+        background-image: linear-gradient(to right, $color 30%, $progress-bar-background-color 30%)
+
+  &:indeterminate
+    animation-duration: $progress-indeterminate-duration
+    animation-iteration-count: infinite
+    animation-name: moveIndeterminate
+    animation-timing-function: linear
+    background-color: $progress-bar-background-color
+    background-image: linear-gradient(to right, $text 30%, $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
+
+  // Sizes
+  &.is-small
+    height: $size-small
+  &.is-medium
+    height: $size-medium
+  &.is-large
+    height: $size-large
+
+@keyframes moveIndeterminate
+  from
+    background-position: 200% 0
+  to
+    background-position: -200% 0