code-lab/node_modules/vuetify/lib/styles/tools/_variant.sass

@use "./absolute" as *
@use "./elevation" as *
@use "../settings/variables" as *

@mixin variant($contained-background, $contained-color, $contained-elevation, $plain-opacity, $name)
  &--variant-plain,
  &--variant-outlined,
  &--variant-text,
  &--variant-tonal
    background: transparent
    color: inherit

  &--variant-plain
    opacity: $plain-opacity

    &:focus,
    &:hover
      opacity: 1

  &--variant-plain
    .#{$name}__overlay
      display: none

  &--variant-elevated,
  &--variant-flat
    background: $contained-background
    color: $contained-color

  @if ($contained-elevation > 0)
    &--variant-elevated
      @include elevation($contained-elevation)

  &--variant-flat
    @include elevation(0)

  &--variant-outlined
    border: $border-width-root solid currentColor

  &--variant-text
    .#{$name}__overlay
      background: currentColor

  &--variant-tonal
    .#{$name}__underlay
      background: currentColor
      opacity: var(--v-activated-opacity)
      border-radius: inherit
      top: 0
      right: 0
      bottom: 0
      left: 0
      pointer-events: none

  .#{$name}__underlay
    position: absolute