The Modern Events Calendar can be styled to match your website branding - particularly the colours and fonts of calendar text, titles, buttons, etc.
Accessing the Modern Events Calendar style settings
You can modify all calendar styles from its style settings area:
Go to the Modern Events Calendar settings in your Wordpress dashboard
Click on Settings
Scroll down, and in the left toolbar within the Calendar settings, click Styling Options

Change calendar colors and fonts
You can make the following customizations from the calendar style settings area:
Change calendar colors by choosing a default color or a custom color
Change your title and content text colors, below the main color section
Change calendar fonts by selecting your desired font from the list