Issues with mobile menu

I am loving working with this theme (through a child’s theme), but am having 3 issues with the menu on narrower (tablet and phone) screens.

The first issue is that the toggle menu pushes the content all the way down the page (I have a long menu). Is it possible to have the content stay toward the top and have the menu overlay it? I would be happy to put the menu contents in a partially transparent box.

The second issue is that on first opening the site or a page, the toggle menu is already opened. Is it possible to have just the word “Menu” with its lines showing until it is clicked?

Finally, the toggle menu treats 3rd order menu items the same as 2nd order, so where I have sub items in my menu like: industries > furniture systems > rhombii training table on the full site, the toggle menu moves the rhombii training table up a level to be equal to its furniture systems parent, no longer a sub item to it.

My site is http://alt.webdesignsbykimberly.com/ and not all pages are built yet, but http://alt.webdesignsbykimberly.com/furniture-systems/bretford-rhombii-training-table-1/ is at least partially there!

Thanks SO MUCH for any help you can give.