Update styles.css

[Dishebh]

Fixes #1513

Checklist

• [x] I have read the Contribution & Best practices Guide and my PR follows them.
• [x] My branch is up-to-date with the Upstream master branch.
• [x] I have added necessary documentation (if appropriate)
• [x] Added Surge preview link

Changes proposed in this pull request:

• Fixed the overflow problem in small screen resolutions.

• https://pr-1514-fossasia-susper.surge.sh

[codecov[bot]]

Codecov Report

Merging #1514 into development will not change coverage. The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #1514   +/-   ##
============================================
  Coverage        62.92%   62.92%           
============================================
  Files               51       51           
  Lines             1451     1451           
  Branches           181      181           
============================================
  Hits               913      913           
  Misses             430      430           
  Partials           108      108

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update d4fa7c4...c16d433. Read the comment docs.