To specify your own colors, you can use hexidecimal color codes. A hexadecimal color is specified with a color code following the format #RRGGBB. RR (red), GG (green) and BB (blue) are hexadecimal ...

In the ‘80s, X system programmers had the option to identify colors the way many developers do today: with a hexadecimal value (AKA hex value, e.g., #FFFF00) or an RGB color code (e.g., 255,255,0).

One of the statements in the CSS pane is "background-color," which determines the color of the header box. Type new values to replace those currently in the "rgb(59, 89, 159)" string.