Autoprefixer 无法为自定义滚动条生成前缀

processors: [
  require('autoprefixer') {
    browsers: [
      '> 0.04%'
    ]
  }
]

@mixin custom-scroll($thumb-bgcolor: $gray-background-color, $track-bgcolor: $white-background-color) {
  &::scrollbar {
    background-color: transparent;
    width: 5px;
    height: 5px;
  }

  &::scrollbar-thumb {
    background: $thumb-bgcolor;
    border-radius: 2px;
    min-height: 6px;
    width: 4px;
  }

  &::scrollbar-track {
    background: $track-bgcolor;
    border-radius: 2px;
  }
}