Treat each input and button as a direct child of the `.group` class, removing the intermediate div and reassign the `tool` classname to those inputs and buttons. One item, the current / total page "set", is wrapped in a .tool div because they should be considered one item (even within the .group container).
And then a bunch of CSS adjustments to match the new structure.
Displaying the total page count near the current page number means we can lose the bottom right toolbar entirely (the renderer could be added to top toolbar, or just left for the metadata info in title bar).
Set as relative position, the toolbar (and mysteriously, the pageInfo box) would jump up 29px (toolbar height) when the "next page" button was clicked. absolute pos fixes this.
Mostly change some properties from things like "transparent" to "unset". A lot of things that are just overriding the default Naturalcrit "colored button". Moved some properties to the top level `.toolbar` class and let it cascade down.
more closely match the properties editor behavior. removed some unnecessary (unused) properties. Outline only appears when element is focused (rather than on hover as well).
replace column-/row-gap with a single gap at 5px. Padding on each child element will provide the space. Set a height on toolbar, so child elements can be set to 100% height to improve bg color change on hover.
Doesn't need to be Sticky positioning, relative is fine (it is still fixed above the iframe). Allows us to remove a bunch of extra properties.
Add a smidgen of padding.
Avoid over-styling of browser-defined slider, but still apply a HB appropriate color scheme. Prevents us from having to create our own tick marks, so we can just define the `option`s in the datalist and get tick marks in the right spot.
