DayCalendar not using CSS Variable for color (issue for user theming)

[snarkyalyx]

When working on a theme, I noticed this specific component (and from what I know only this component) uses its own color instead of using e.g. a button or modal color:

platform/plugins/calendar-resources/src/components/DayCalendar.svelte

Line 1375 in 0f7a111

background-color: rgba(64, 109, 223, 0.1);

Is this intentional? Why isn't this specified as a variable?