node_modules/@covalent/core/chips/_chips-theme.scss

@import '../common/styles/theme-functions';
@import '../common/styles/typography-functions';

@mixin td-chips-typography($config) {
  .td-chip-content {
    font: {
      family: td-font-family($config);
      size: td-font-size($config, caption);
    }
  }
}

@mixin td-chips-theme($theme) {
  $primary: map-get($theme, primary);
  $accent: map-get($theme, accent);
  $warn: map-get($theme, warn);
  $background: map-get($theme, background);
  $foreground: map-get($theme, foreground);
  $is-dark-theme: map-get($theme, is-dark);

  // chips
  td-chips {
    // chip
    .mat-basic-chip {
      background: mat-color($background, status-bar);
      color: mat-color($foreground, text);
      &:focus:not(.td-chip-disabled) {
        mat-icon:hover {
          color: mat-color($foreground, icon);
        }
        &.mat-primary {
          background: mat-color($primary);
          &, mat-icon {
            color: mat-color($primary, default-contrast);
          }
        }
        &.mat-accent {
          background: mat-color($accent);
          &, mat-icon {
            color: mat-color($accent, default-contrast);
          }
        }
        &.mat-warn {
          background: mat-color($warn);
          &, mat-icon {
            color: mat-color($warn, default-contrast);
          }
        }
      }
      mat-icon.td-chip-removal {
        color: mat-color($foreground, hint-text);
        &:hover {
          color: mat-color($foreground, icon);
        }
      }
    }
    .mat-form-field-underline {
      background-color: mat-color($foreground, divider, if($is-dark-theme, 0.7, 0.42));
    }
    &.mat-primary {
      .mat-form-field-underline .mat-form-field-ripple {
        background-color: mat-color($primary);
      }
    }
    &.mat-accent {
      .mat-form-field-underline .mat-form-field-ripple {
        background-color: mat-color($accent);
      }
    }
    &.mat-warn {
      .mat-form-field-underline .mat-form-field-ripple {
        background-color: mat-color($warn);
      }
    }
    &.ng-invalid {
      .mat-form-field-underline .mat-form-field-ripple {
        background-color: mat-color($warn);
      }
      .mat-form-field-label-wrapper > label.mat-form-field-label.mat-form-field-empty {
        color: mat-color($warn);
      }
    }
  }
}