This can be done with the some CSS code that needs to be added to the “Custom CSS” textarea on the “Plugin Options” screen of TablePress:

.tablepress-id-N tbody td {
	font-family: Tahoma;
	font-size: 14px;
	font-weight: bold;
	color: #ff0000;
}Code language: CSS (css)

The N needs to be changed to the ID of the table in question (or use .tablepress as the first part of the selector to have this code apply to all TablePress tables on the site). The values for font-family, font-size, font-weight and color can of course be adjusted or removed, if they are not needed.

If you prefer a visual interface for changing colors, check out the Default Style Customizer feature that is part of the TablePress premium license plans.