Slider specific variables

Configure variables specific to slider widget

`$gbc-SliderWidget-field-height-ratio`

Type: size

Default value: $theme-field-height-ratio

Computed value: 0.7

`$gbc-SliderWidget-background-color`

Type: color

Default value: $theme-separator-color

Computed value: #e0e0e0

`$gbc-SliderWidget-color`

Type: color

Default value: $theme-primary-background-color

Computed value: #1976d2

`$gbc-SliderWidget-disabled-color`

Type: color

Default value: $theme-disabled-color

Computed value: rgba(33, 33, 33, 0.54)

`$gbc-SliderWidget-thumb-hover-color`

Type: color

Default value: $theme-primary-emphasis-background-color

Computed value: #1e88e5

`$gbc-SliderWidget-focus-border-color`

Type: color

Default value: $mt-field-focus-border-color

Computed value: #1976d2