My sample Storymap JS did not scroll well, because our wordpress theme is too narrow.  It turns out there is a workaround.  There is a plugin installed on our COPLAC digital sites called “Fullwidth Page Templates.” You put in wp-admin to get to edit your page, then select plugins, and activate that one, then you will have the option on each page (in the editing interface) to choose a width setting for it in the Page Attributes section. Page Attributes appears to your right when you are editing.  Pull down the arrow under Template, and select “FW full width, no header footer,” or whichever one works for you.  Then go to the text portion of the page, and paste in the html code from your storymap.

Now that works much better.