@beefstick: That little bit of code worked like a charm! Thank you!!
@noaneo: Thank you so much for helping me get this straightened out. The more I put it into proper order, the better I understand this.
1. I took out the unnecessary lines in the top section of my style sheet, as you suggested, but left the version number. (It appeared that way once I uploaded the child theme, so I left it as it was, except for naming it.)
2. I never was certain where to start placing my own changes, so I just guessed that it should be right after the comment saying it starts here. I have now moved all my alterations to below the responsive codes. And that’s where I’ll add anything new I write.
The site is still under construction and is not open to the public yet, but it should be soon. I’ll definitely post a link to it once it is.
It’s exciting to see it beginning to look the way I want it to. Thank you all so much!
I’m going try again to change the dropdown-menu background color. With the custom css in the right places, maybe it will work this time.