md-content.md-THEME_NAME-theme {
  color: '{{foreground-1}}';
  background-color: '{{background-default}}';
}



md-content.md-THEME_NAME-theme {
  color: '{{foreground-1}}';
  background-color: '{{background-color}}';
}

Allow md-content to use md-hue-x for background colors
fix(md-content): Allow md-content to use md-hue-x for background colors

re-introduce ability for md-content to use md-hue-x colors

closes #7886
