The color and text size of any Tile Headers, Tables, or Statistical tiles can be altered. To do so, click the Hamburger menu, and select "Tile Formatting". To change the header size, select Header Size and adjust the slider.
To change header color, select from one of the pre-set colors (based off your teams primary and secondary colors, the opponent's primary and secondary colors, black, and white). You can also type in a hex color code to enter a custom color too.
The same options are available for size and color for the data within any given tile under "Text Size" and "Text Color".