code: public function setRGB($pValue)
      {
          if ($pValue == '') {
              $pValue = '000000';
          }
          if ($this->isSupervisor) {
              $styleArray = $this->getStyleArray(['argb' => 'FF' . $pValue]);
              $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
          } else {
              $this->argb = 'FF' . $pValue;
          }
  
          return $this;
      }
docs: Set RGB.
  
  @param string $pValue RGB value
  
  @return Color