Sticky to the top of the viewport

An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up.

Sticky to the green box

An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up. An editable content mock–up.

The panel should stick to me instead of the viewport.