I think it can be improved by darkening var(--color-calendar-graph-day-bg)
to #292f38
or brightening var(--color-calendar-graph-day-L1-bg)
to #004226
Top: current design with inactive days filled with
#2d333b
Mid: inactive days darkened to
#292f38
Bottom: inactive days darkened to
#292f38
, L1 brightened to #004226
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