This commit updates the CSS styles for better consistency and correctness. The changes involve:
1. Replacing 'z-index: -1px' with 'z-index: -1' to correct the z-index value. The value should be an integer, not a length with a unit.
2. Replacing 'font-size:bold;' with 'font-weight:bold;' to set the font weight to bold properly.
Please note that I haven't tested the changes yet, but they should have a positive impact on the overall appearance and functionality of the elements styled with these CSS rules.
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