pi-hole.css: fix glow to use the current color

[XhmikosR]

Signed-off-by: XhmikosR xhmikosr@gmail.com

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[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-5-1-released/35577/1