'Custom CSS' Button on Toolbar

I find it to be rather time consuming to get to the 'Custom CSS' button. I want to make a toolbar button that would open the Custom CSS panel. I've got the button working (currently it's going to Clear Cache), but I can't seem to figure out how to connect it to the Custom CSS panel. The panel doesn't seem to have an associated URL. Any ideas?

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MrKDilkington replied on at Permalink Reply
Hi Kurtopsy,

The Customize panel is loaded using AJAX. From there, clicking on the Custom CSS gear icon AJAX loads the Ace editor and the Custom CSS form modal.

I don't much about this topic, but I believe you could start looking here:
Customize panel
Custom CSS form modal
Kurtopsy replied on at Permalink Reply
Thanks MrKDilkington! This helps. I'll see what I can make happen.