Update to wiki.css

[DmitriiOxen]

fix of arrow displayed on the left of menu button

Fixes #9928

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[DmitriiOxen]

@TildaDares please review changes

[Tlazypanda]

Hey @DmitriiOxen LGTM 🎉 Thanks for contributing and welcome to Publiclab 🎈

[noi5e]

@DmitriiOxen this looks great!!! Merging now. Congrats and welcome to Public Lab!

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[noi5e]

Also noting that @jordanburr22 deserves credit for solving this issue as well in #9941 :)