MudDataGrid: Fix Loading Indicator scrolls out of view with FixedHeader

[versile2]

Description

Resolves #10833 with just CSS
Altered existing viewer page to test
Added Docs example for other options

How Has This Been Tested?

No additional code added

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (bd4e4d0) to head (edb5988).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10838      +/-   ##
==========================================
- Coverage   91.86%   91.86%   -0.01%     
==========================================
  Files         427      427              
  Lines       13446    13454       +8     
  Branches     2595     2596       +1     
==========================================
+ Hits        12352    12359       +7     
  Misses        523      523              
- Partials      571      572       +1     

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[danielchalmers]

CSS should be formatted with 2 spaces

[versile2]

CSS should be formatted with 2 spaces

Fixed.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[henon]

Thanks @versile2