[deno]

When you bend your arms at 90° where are your palms? With proper posture/keyboard height they should be over the keyboard. If you’re sitting straight it’s natural to bring your keyboard to the edge of the desk. But if you prefer to be under the desk then just rest on the desk.

I made a really quick sketch some time ago maybe it helps: http://svgur.com/s/7e6

That wrist angle on the green dude is very exaggerated, the point was to show that the fingers are in their natural positions, rather than curled, which is what happens when your wrists are glued.

EDIT: Also just look where the piano lady is resting her hands.