colorSelected: 'hsl(214, 96%, 53%)'
Replaces certain colors of the current color scheme.
Currently you can redefine:
colorSelected- The color used for certain interactive, selected or highlighted user interface elements (e.g. buttons).
cursorTooltipBackgroundColor- The background color for the whole tooltip.
colorTitle- The color of certain tiles, such as in modal dialogs or the Category Filter.
Blue shades are the standard for links and action buttons. They have the unique properties of being easy on the eyes and colorblind safe - less prone to be confused with other colors. Bear this in mind when using other colors that might have less contrast with the background or might be uncomfortable to a percentage of your user base.