How to style stepper

Styles from the material/stepper package can be customized using the stepper-overrides mixin. This mixin accepts a set of tokens that control how the components will look, either for the entire app or under a specific selector. For example:
@use '@angular/material' as mat;

// Customize the entire app. Change :root to your selector if you want to scope the styles.
:root {
  @include mat.stepper-overrides((
    header-icon-foreground-color: orange,
    header-selected-state-icon-background-color: red,
  ));
}
You can find the full list of supported mixins and tokens below.

Tokens supported by stepper-overrides

NameTypeBased on system token
header-focus-state-layer-shapeBase None
header-hover-state-layer-shapeBase None
header-icon-foreground-colorColor--mat-sys-surface
header-selected-state-icon-background-colorColor--mat-sys-primary
header-selected-state-icon-foreground-colorColor--mat-sys-on-primary
header-done-state-icon-background-colorColor None
header-done-state-icon-foreground-colorColor None
header-edit-state-icon-background-colorColor--mat-sys-primary
header-edit-state-icon-foreground-colorColor--mat-sys-on-primary
container-colorColor--mat-sys-surface
line-colorColor--mat-sys-outline
header-hover-state-layer-colorColor--mat-sys-inverse-surface
header-focus-state-layer-colorColor--mat-sys-inverse-surface
header-label-text-colorColor--mat-sys-on-surface-variant
header-optional-label-text-colorColor--mat-sys-on-surface-variant
header-selected-state-label-text-colorColor--mat-sys-on-surface-variant
header-error-state-label-text-colorColor--mat-sys-error
header-icon-background-colorColor--mat-sys-on-surface-variant
header-error-state-icon-foreground-colorColor--mat-sys-error
header-error-state-icon-background-colorBase None
container-text-fontTypography--mat-sys-body-medium-font
header-label-text-fontTypography--mat-sys-title-small-font
header-label-text-sizeTypography--mat-sys-title-small-size
header-label-text-weightTypography--mat-sys-title-small-weight
header-error-state-label-text-sizeTypography--mat-sys-title-small-size
header-selected-state-label-text-sizeTypography--mat-sys-title-small-size
header-selected-state-label-text-weightTypography--mat-sys-title-small-weight
header-heightDensity None
Azure & Blue theme selected.