I am not able to see icons in Document card although I am using class components

Question

Icons Which I am Using Are Of Fluent ui's and I am Following IconsProps For the css. Example:

const closeIcon: IIconProps = {
  iconName: 'ChromeClose',
  styles: {
    root: {
      color: 'white',
      padding: '18px 0px',
      fontSize: "15px"
    }
  }
};

I want to use Icons in Documentcard via Class Components