How do I set beacon-color from my color theme?

[debajit]

I would like to set my beacon-color to "#721cd4".

How can I set this from my init.el or from my color theme? Is there an example I could use with a string color value?

(My elisp is not very good, so any help is appreciated. I can set a face easily, but I'm having trouble figuring out how to set beacon-color)

[Malabarba]

Try calling M-x customize-variable. Type in beacon-color and hit RET. That should let you customize the variable.