node_modules/@angular/material/table/_table-theme.scss

@import '../core/theming/palette';
@import '../core/theming/theming';
@import '../core/typography/typography-utils';

@mixin mat-table-color($config-or-theme) {
  $config: mat-get-color-config($config-or-theme);
  $background: map-get($config, background);
  $foreground: map-get($config, foreground);

  .mat-table {
    background: mat-color($background, 'card');
  }

  .mat-table thead, .mat-table tbody, .mat-table tfoot,
  mat-header-row, mat-row, mat-footer-row,
  [mat-header-row], [mat-row], [mat-footer-row],
  .mat-table-sticky {
    background: inherit;
  }

  mat-row, mat-header-row, mat-footer-row,
  th.mat-header-cell, td.mat-cell, td.mat-footer-cell {
    border-bottom-color: mat-color($foreground, divider);
  }

  .mat-header-cell {
    color: mat-color($foreground, secondary-text);
  }

  .mat-cell, .mat-footer-cell {
    color: mat-color($foreground, text);
  }
}

@mixin mat-table-typography($config-or-theme) {
  $config: mat-get-typography-config($config-or-theme);
  .mat-table {
    font-family: mat-font-family($config);
  }

  .mat-header-cell {
    font-size: mat-font-size($config, caption);
    font-weight: mat-font-weight($config, body-2);
  }

  .mat-cell, .mat-footer-cell {
    font-size: mat-font-size($config, body-1);
  }
}

@mixin _mat-table-density($config-or-theme) {}

@mixin mat-table-theme($theme-or-color-config) {
  $theme: mat-private-legacy-get-theme($theme-or-color-config);
  @include mat-private-check-duplicate-theme-styles($theme, 'mat-table') {
    $color: mat-get-color-config($theme);
    $density: mat-get-density-config($theme);
    $typography: mat-get-typography-config($theme);

    @if $color != null {
      @include mat-table-color($color);
    }
    @if $density != null {
      @include _mat-table-density($density);
    }
    @if $typography != null {
      @include mat-table-typography($typography);
    }
  }
}