Office christmas party. Group of joyful colleagues having fun at new year celebration. Happy smiling people holding golden number balloons, 2018 year symbol. Greeting card for co-workers mockup Shutterstock . vector - Office christmas party. Group of joyful colleagues having fun at new year celebration. Happy smiling people holding golden number balloons, 2018 year symbol. Greeting card for co-workers mockup - ID: 734892769