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The plugin is designed to use the site theme’s CSS as much as possible to make the calendar blend in with the rest of the site, so there’s not an automatic way to force any sort of “plugin default” appearance. (There really isn’t a plugin default appearance for things like fonts.)
I edited the style.min.cs and changed the font-size from 70% to 100% which was much more readable.
.ics-calendar-month-grid td,.ics-calendar-month-grid th