Я обычно добавляю переменные, подобные этим:
$mat-light-theme-background: (
status-bar: map_get($mat-grey, 300),
app-bar: map_get($mat-grey, 100),
background: map_get($mat-grey, A100),
hover: rgba(black, 0.04), // TODO(kara): check style with Material Design UX
card: white,
dialog: white,
disabled-button: $black-12-opacity,
raised-button: white,
focused-button: $black-6-opacity,
selected-button: map_get($mat-grey, 300),
selected-disabled-button: map_get($mat-grey, 400),
disabled-button-toggle: map_get($mat-grey, 200),
unselected-chip: map_get($mat-grey, 300),
disabled-list-option: map_get($mat-grey, 200),
);
$mat-light-theme-foreground: (
base: black,
divider: $dark-dividers,
dividers: $dark-dividers,
disabled: $dark-disabled-text,
disabled-button: rgba(black, 0.26),
disabled-text: $dark-disabled-text,
hint-text: $dark-disabled-text,
secondary-text: $dark-secondary-text,
icon: rgba(black, 0.54),
icons: rgba(black, 0.54),
text: rgba(black, 0.87),
slider-min: rgba(black, 0.87),
slider-off: rgba(black, 0.26),
slider-off-active: rgba(black, 0.38),
);
// Create the theme object (a Sass map containing all of the palettes).
$material-theme: mat-light-theme($primary, $accent, $warn);