Tested the issue in Android and could not reproduce the issue.

Steps Followed:
1. Launched Browser
2. Navigated to quora.com
3. Logged in with valid credentials
4. Scrolled down the page and no black blocks are observed.

Chrome versions tested:
61.0.3163.98

OS
Android 5.0.0

Android Devices 
5.0.0:; Micromax A106 Build?LRX21M

Requesting MTV team to take a look on this issue as 5.0.2 LRX22G Xiaomi Mi4i device is not available with clank-hyd team.

Thanks!!

Thanks for your report! We couldnt repro this issue on latest Chrome 61.0.3163.98.
Can you please provide below details for further triaging?
1. Chrome Version
2. Screenshot and bug report (if possible)

How to take a bug report on Android devices:

'Settings' -> 'Developer options' -> 'Take bug report'

Note:
You must have developer settings enabled.

Enable developer settings:

Go to the settings menu, and scroll down to "About tablet” or “About phone.” Tap it.
Scroll down to the very bottom, where you see "Build number." 
Tap the build number seven (7) times. After the third tap, you'll see a dialog that says you're four taps away from being a developer. On the seventh tap, you’ll see a dialog that says developer setting are enabled.

I just tried reproducing the error in Chrome beta and couldn't. Seems like the issue is fixed somehow. Thanks for the proactive support guys :)

Thank you for providing more feedback. Adding requester "rsgavara@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

@ajaysinghajay11 -- Thank You for the update.
Marking the issue as Won't Fix as per Comment# 5. Please feel free to raise a new bug if the issue is again seen.