Fix 7 Maintainability issues in multiple files

[DarkIntaqt]

CodeFactor found multiple issues:

Unexpected extra semicolon (no-extra-semicolons)

• src\css\user.css:35
  Commit 324aaaf

Unexpected duplicate selector ".levelup #levelup", first used at line 191 (no-duplicate-selectors)

• src\css\user.css:192
  Commit 0c8c54e

Unexpected longhand value '0px 5px 5px 5px' instead of '0px 5px 5px' (shorthand-property-no-redundant-values)

• src\css\user.css:55
  Commit 0c8c54e

Unexpected longhand value '20px 5px 5px 5px' instead of '20px 5px 5px' (shorthand-property-no-redundant-values)

• src\css\user.css:43
  Commit 0c8c54e

Unexpected empty block (block-no-empty)

• src\css\user.css:1
  Commit 0c8c54e

Unexpected shorthand "border-top" after "border-top-color" (declaration-block-no-shorthand-property-overrides)

• src\index.css:38
  Commit 0c8c54e

Unexpected longhand value '20px 20% 0 20%' instead of '20px 20% 0' (shorthand-property-no-redundant-values)

• src\css\start.module.css:85
  Commit 6376b33