Allow for the ability to set query parameters to populate the background and foreground colors.
This will allow you to link to specific color contrast checks.
Take into consideration a few different options of query parameters (foreground/background; f/b; text/background; t/b).
Also, add the ability to handle hex short codes (fff = ffffff).
Example: https://ccc.morsecodemedia.com/?f=7c7c7c&b=ffffff or https://ccc.morsecodemedia.com/?t=7c7c7c&b=fff