When you’re branding your dashboards for your own specific company, it is useful to have your custom colors styled and named to be stored in the UI for easy access without going back and forth to lookup specific Hex codes.
This can be done using a JavaScript override and editing the list of colors. Running on Version 7+, this can be done by going to Setup -> App Styling and double click on the JavaScript resource to add something similar to this:
Note: the ‘value’ provided is an integer representation of your ARGB value and there are a lot of tools online that can help you get this value. Here’s is an example:
https://www.rapidtables.com/convert/number/hex-to-decimal.html