fix markdown on light

[willmcgugan]

Fixes #3123

[codecov-commenter]

Codecov Report

Patch coverage: 92.85% and project coverage change: -0.03% ⚠️

Comparison is base (aabfd16) 98.30% compared to head (db07a2a) 98.28%.
Report is 8 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3132      +/-   ##
==========================================
- Coverage   98.30%   98.28%   -0.03%     
==========================================
  Files          74       74              
  Lines        8038     8044       +6     
==========================================
+ Hits         7902     7906       +4     
- Misses        136      138       +2     

Flag	Coverage Δ
unittests	98.28% <92.85%> (-0.03%)	⬇️

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Files Changed	Coverage Δ
rich/text.py	99.01% <66.66%> (-0.17%)	⬇️
rich/console.py	98.04% <100.00%> (+<0.01%)	⬆️
rich/markdown.py	99.45% <100.00%> (ø)
rich/syntax.py	98.19% <100.00%> (-0.29%)	⬇️

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