Pages with wide horizontal content could horizontally scroll on mobile due to `.page-wrapper` not having fixed width in f851142fb2
Re-add overflow-wrap which was removed in e6dba41f3d (in attempt to simplify logic).
Add horizontal scroll to unresponsive Plotly charts.
Also, refactor chart style and refactor callout styles into dedicated file.
This commit attempts to fix https://discord.com/channels/722225264733716590/742863504515793149/774343154949816350
George Cushen