message: chore(progress-indicator): flexible style for line
  This change ensures the elements in shadow DOM catches up with change
  in the width of `<bx-progress-step>`.
  Fixes
diff: @@ -25,6 +25,13 @@ $css--plex: true !default;
  @extend .#{$prefix}--progress-step--incomplete;
  outline: none;
  +
  + // Carbon core style has hard-coded width whose value is the same as `.bx--progress-step`.
  + // We override it so changing width of `<bx-progress-step>` automatically changes the width here.
  + // https://github.com/carbon-design-system/carbon-custom-elements/issues/325
  + .#{$prefix}--progress-line {
  + width: 100%;
  + }
  }
  :host(#{$prefix}-progress-step[disabled]) {
  