You can style the HomeRunner booking box and availability calendar to match your brand colors and fonts. There are two layers of styling.
Calendar colors. These are a built-in setting. In WordPress, go to HomeRunner > Settings > Availability Calendar and set the colors for available, selected, booked, blocked, and unavailable nights, plus the price text color. These settings apply to the calendar shortcode everywhere on your site.
Buttons, labels, fields, and typography. These follow your site’s stylesheet. The widgets inherit your theme’s font automatically. Button color, label color, and field sizing are controlled with a small CSS block scoped to the HomeRunner containers. On sites using a theme HomeRunner did not build, this CSS is added as a code snippet (for example using the WPCode plugin), so your theme files stay untouched and the change can be removed in one step.
Share your brand colors with support, or point support to a page that uses them, and the widgets can be matched to it.