Pure CSS Galley Carousel with Keypress?

Hi I have a pure css carousel lightbox which is working fine.
However, I would like to do three things:
-when i press ESC it simulates clicking the close button;
-when pressing left and right it simulates clicking the left/right button; and,
-when i click off the image, the lightbox closes.
Ideally it would be great if this can be done in pure css.

Here is a fiddle: https://ift.tt/2ZILktK

(If not, willing to accept jquery )

Here is what I have:

<span...

HTML:

Pure CSS Galley Carousel with Keypress?

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