@meetdilip Just a thought, I noticed on your website that you're only using css colours to create your tiles. If this is the case, you could always cheat slightly and use an image as the gloss. I created this one for you to download and try: https://i.imgur.com/zLBAf4u.png
Download that, and set it as the image on your categories, then set the image class to cover from the dropdown, this will produce an effect like the attached:

You can then specify the colour underneath as you normally would. If you had a specific angle you wanted, I can change the gloss image for you. (Once, time is money after all. ;))