Improve handling of responsive layouts

[philippjfr]

• Improves the look and feel of Cards
• Experiment with overflow-x option on non-root responsive layouts

[codecov]

Codecov Report

Merging #4491 (a0911fa) into main (f4395e5) will decrease coverage by 46.72%.
The diff coverage is 36.36%.

❗ Current head a0911fa differs from pull request most recent head 5544f62. Consider uploading reports for the commit 5544f62 to get more accurate results

@@             Coverage Diff             @@
##             main    #4491       +/-   ##
===========================================
- Coverage   82.24%   35.52%   -46.72%     
===========================================
  Files         243      235        -8     
  Lines       35316    35119      -197     
===========================================
- Hits        29044    12476    -16568     
- Misses       6272    22643    +16371     

Flag	Coverage Δ
ui-tests	35.52% <36.36%> (-0.29%)	⬇️
unitexamples-tests	?

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Impacted Files	Coverage Δ
panel/layout/card.py	72.58% <ø> (-20.97%)	⬇️
panel/layout/base.py	47.93% <36.36%> (-44.36%)	⬇️
panel/__main__.py	0.00% <0.00%> (-100.00%)	⬇️
panel/models/katex.py	0.00% <0.00%> (-100.00%)	⬇️
panel/models/mathjax.py	0.00% <0.00%> (-100.00%)	⬇️
panel/models/perspective.py	0.00% <0.00%> (-100.00%)	⬇️
panel/pane/vtk/synchronizable_deserializer.py	0.00% <0.00%> (-97.59%)	⬇️
panel/models/ace.py	0.00% <0.00%> (-91.67%)	⬇️
panel/tests/widgets/test_input.py	8.86% <0.00%> (-91.14%)	⬇️
panel/tests/io/test_embed.py	8.58% <0.00%> (-90.86%)	⬇️
... and 173 more

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