Make keyboard accessible

[ChrisBAshton]

Hello! 👋Just seen your plugin on http://www.theboardroomclimbing.com/ and discovered it wasn't very keyboard accessible. It's the last element in the DOM but it's visually the first thing in the page, so I'd expect the first tab of the keyboard to go to the Whatever button:

Currently have to tab through all of the links on the page before I'm able to dismiss the cookie notice.

Not too sure about the plugin internals, but would suggest attaching the cookie notice to the top of the DOM rather than the bottom, and/or applying tabindex="1" on the buttons to bring them up in the tab order.

Thanks for your time!