tiny Interactives: textBoxes need width defined

[#47173057]

In tiny Interactives textBoxes need width defined
because of minimum font size applied to Interactive
as a whole.

At "tiny" size without also defining "width" textBoxes
can extend outside of model frame
Make sliders match upstatement's work

Circular, centered handle moving along a narrow groove, 
inside a darkened, rounded container.

Fix existing handle so that center is over the value,
instead of left edge. (This would have been more noticeable
now that handle is wider.

[#46375547]
disable scrollbars in embeddable Interactive

[#47180321]

When an Interactive is small the presence of a vertical
scrollbar was causing incorrect Semantic Layout 
calculations of the top and bottom bar width when
the page was loaded.