Sue, this is a visual demonstration of Acorn's statement using your own website (mobile version) - using the menu go to the about section (which is one of the anchors on your single page website); then scroll back upwards until you see the menu; you will see 'About' is in black text; you will also see in the address bar the About anchor address.
Now, refresh the browser and it will return to the About anchor, in the same way as if you had pressed the About link - just to prove this is no fluke, do the same for Contact and Volunteering.
Apart from centre-aligning a couple of your headings (Contact Us being one) it looks OK to me. I'd give yourself break
Gary
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