code-lab/node_modules/vuetify/lib/components/VFab/_mixins.scss

@use 'sass:math';
@use 'sass:map';
@use 'sass:meta';
@use '../../styles/settings';
@use '../../styles/tools';
@use './variables' as *;

@mixin fab-sizes ($map: $fab-sizes, $immediate: false) {
  @each $sizeName, $multiplier in $fab-size-scales {
    $size: map.get($map, 'font-size') + math.div(2 * $multiplier, 16);
    $height: map.get($map, 'height') + (12px * $multiplier);

    // .v-fab .v-btn--size-#{$sizeName} {
    //   --v-btn-size: #{$size};
    //   --v-btn-height: #{$height};
    // }

    .v-fab--bottom .v-btn--size-#{$sizeName} {
      bottom: -1 * $height / 2;
    }
  }
}