Support Dark mode

[zeyadetman]

First, Thanks for the great effort on the banner. It's really impressive!

There's a small style issue I just found while I installed it on my website.

• I use both modes (dark/light), in the dark mode, the banner looks like this

This happens because of some styles overwrites. I think It'll better to set fixed colors to the elements, Not sure depending on your preferences.

Thanks, Keep the good work!

I fixed it in my fork and also added a intro page.