Remove divider line in PrimeNG calendar component

I'm using the PrimeNG calendar component. How (if possible) can I remove or change the color of the line/divider between the date-picker-header and the date-picker itself?



Basic Stackblitz with PrimeNG calendars all including the divider: https://stackblitz.com/edit/primeng-calendar-demo?file=README.md

Calendar component in PrimeNG's github repo: https://github.com/primefaces/primeng/blob/master/src/app/components/calendar/calendar.ts

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