2.1 How to change the color theme of the widget and of its elements?

In the settings of the administration panel you can choose only general color theme. To specify certain colors you need to use theme parameter in the code. You can specify certain colors for the following elements:

/// javascript
function CreateTheme(color) { // color: 0-360 number
return {
colorBlack: "#000",
colorWrite: "#fff",
colorLink: `hsl(${color}, 44%, 52%)`,
colorLinkHover: `hsl(${color}, 44%, 40%)`,
colorLinkNoActive: `hsl(${color}, 26%, 36%)`,
colorLinkDark: `hsl(${color}, 44%, 76%)`,
colorCommentBgDefault: `hsl(${color}, 44%, 93%)`,
colorCommentSelect: `hsl(${color}, 43%, 85%)`,
colorCommentFocus: `hsl(${color}, 42%, 72%`,
colorBrend: `hsl(${color}, 45%, 71%)`,
colorRed: "#ef4c47"
};
}