This is the previous menu #3 with the extra feature that the menu icon is fixed at the top right of the screen and if the page is scrolled when the menu is selected, it will return to the same scroll position when the menu is de-selected.
This version uses 'flexbox' to center the menu vertically and has a panel to the left of the menu which can be used for any information you like. The left panel will scroll when it becomes too large for the height of the screen.
To open the menu click/tap the three bar icon at the top right of the page. The menu will always be shown in the start position with all sub menus closed.
To open a sub menu just click/tap an item with the down arrow to the left, and to close the same sub menu click/tap the same list item or click/tap another branch of the menu.
The menu will stay vertically aligned until it becomes too high for screen and requires scrolling to see all the items.
To close the menu click/tap the 'cross' at the top right of the screen, this will close any open sub menus before closing the menu.
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