opt-cc/static/src/app/global.helpers.ts

export const CSSHelpers = {
  getBackgroundCSS: (imageUrl) => {
    return 'background-image: url(' + imageUrl + ');' +
      'background-size: cover;' +
      'background-attachment: fixed;' +
      'background-position: center;' +
      'background-repeat: no-repeat;';
  }
};