$euiPanelBackgroundColorModifiers: (
  'plain':   $euiColorEmptyShade,
  'subdued': $euiColorLightestShade,
  'accent':  tintOrShade($euiColorAccent, 90%, 70%),
  'primary': tintOrShade($euiColorPrimary, 90%, 70%),
  'success': tintOrShade($euiColorSecondary, 90%, 70%),
  'warning': tintOrShade($euiColorWarning, 90%, 70%),
  'danger':  tintOrShade($euiColorDanger, 90%, 70%),
);