I know someone else that's from India on here, also I don't know any css that's why I told you about the thread in my section(it's a sticky so it might be in comp & tech or in webmasters discussion). And I think you mean decrease because increase means to make it cost more and it really can't be decreased since they're at a fair price.
There's a css thread guide in my section somewhere. And to get an image background like mine you will have to become a supporter tier 3(I think it is) that can let you upload bigger image files and then use that. Also you will need a transparent profile pic