@sdetweil
Bingo. All systems go…
Thanks once again.
I am doing the backup restore thing now.

Awesome. It really works. I had the same issue and it was really frustrating, until i stumbled upon this solution. Great my PIR-sensor module was revived. I just followed the steps mentioned and voila…it has come back to life. Thanks a ton, it is selfless gentlemen like yourself who keep this world going. Kudos.

@MMRIZE I am stumped. The changes to the color happened, but the resizing still not responding.

@sdetweil
Obviously i am doing something wrong.
I am unable to get to the style even when newsfeed element is highlighted. Or, the style is picking up from main.css and changing anything here will impact all styles.

@MMRIZE Finally ! Finally…
I disabled all modules, except newsfeed, then cleared out the custom.css configs and added a fresh config for newsfeed as suggested above and finally it worked.
So was the issue just because of the corrupt custom.css?
Anyways, this issue has enabled me to learn working with the developer console. I am glad.
Thank you @MMRIZE and thank you @sdetweil . Ever obliged.