Cleanup postcss file

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.26%. Comparing base (8379da8) to head (9556878). Report is 9 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1317 +/- ## ========================================== + Coverage 80.65% 81.26% +0.61% ========================================== Files 233 233 Lines 6203 6203 Branches 1077 1077 ========================================== + Hits 5003 5041 +38 Misses 1119 1119 + Partials 81 43 -38 ``` | [Flag](https://app.codecov.io/gh/LXCat-project/LXCat/pull/1317/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LXCat-project) | Coverage Δ | | |---|---|---| | [app](https://app.codecov.io/gh/LXCat-project/LXCat/pull/1317/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LXCat-project) | `57.42% <ø> (+3.78%)` | :arrow_up: | | [converter](https://app.codecov.io/gh/LXCat-project/LXCat/pull/1317/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LXCat-project) | `65.31% <ø> (ø)` | | | [database](https://app.codecov.io/gh/LXCat-project/LXCat/pull/1317/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LXCat-project) | `83.56% <ø> (ø)` | | | [schema](https://app.codecov.io/gh/LXCat-project/LXCat/pull/1317/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LXCat-project) | `94.15% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LXCat-project#carryforward-flags-in-the-pull-request-comment) to find out more.

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