Hi there, I have looked through the GitHub site to find the colors used with their dark theme (if you're into that). I have never used ruby before, so I may or may not open a PR. Feel free to scoop this change if you'd like.

The hex color codes are as follows:

#161b22 -- color-calendar-graph-day-border (no contributions)
#1e6823 -- L1 bg
#034525 -- L2 bg
#0f6d31 -- L3 bg
#00c647 -- L4 bg (most contributions)
#0d1117 -- site background in dark mode

I believe these should be added here, as a new dark scheme:

githubchart-api/color.rb

Lines 1 to 5 in 2a12825

    
           COLOR_SCHEMES = { 
        
               default: ['#eeeeee', '#d6e685', '#8cc665', '#44a340', '#1e6823'], 
        
               halloween: ['#EEEEEE', '#FFEE4A', '#FFC501', '#FE9600', '#03001C'], 
        
               teal: ['#EEEEEE', "#7FFFD4", "#76EEC6", "#66CDAA", "#458B74"] 
        
           }

i.e. dark: ['#161b22', "#1e6823", "#034525", "#0f6d31", "#00c647"]

It's not obvious to me where the background color of the SVG gets set, but that should be #0d1117.

Hope this helps!

	COLOR_SCHEMES = {
	default: ['#eeeeee', '#d6e685', '#8cc665', '#44a340', '#1e6823'],
	halloween: ['#EEEEEE', '#FFEE4A', '#FFC501', '#FE9600', '#03001C'],
	teal: ['#EEEEEE', "#7FFFD4", "#76EEC6", "#66CDAA", "#458B74"]
	}

Dark mode chart #21

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