Clean up blog page css

[int-y1]

Visible changes:

• Blog sidebar became slightly narrower.
• "RSS / Atom" is moved up 0.25em.

[codecov-commenter]

Codecov Report

Base: 46.67% // Head: 46.67% // No change to project coverage 👍

Coverage data is based on head (6c6ae6f) compared to base (44fc069).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2121   +/-   ##
=======================================
  Coverage   46.67%   46.67%           
=======================================
  Files         239      239           
  Lines       13250    13250           
=======================================
  Hits         6185     6185           
  Misses       7065     7065           

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[Xyene]

Could you please attach some screenshots?

[int-y1]

Could you please attach some screenshots?

Before:

After:

[Xyene]

Before, the contents of ongoing contests / comment stream / new problems had the same amount of left margin (roughly matching the amount of top margin), while now only the comment stream and new problems do.

[int-y1]

Reverted flexbox ratios. Now, the only visible change is "RSS / Atom".

[Xyene]

LGTM, thanks!