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+Color scheme is the set of configuration options that changing colors of various theme elements: buttons, text, etc.
+
+Configuration options are divided by **layers** - groups of color options. Higher levels are for more granular options. Only **layer 1** is required, but since `theme.conf` already contains these options, they can be omitted in `theme.conf.user`, but it's recommended to redefine them, as they can define full color scheme.
+
+You can use either [SVG color names](https://www.w3.org/TR/SVG/types.html#ColorKeywords) or hexadecimal colors in `#RRGGBB` or `#AARRGGBB` format.
+
+> **Note:** if you're using only **layer 1**, backgrounds will be semi-transparent automatically. But if you set background colors manually on higher layers, they will lose automatic transparency. So it's recommended to use `#AARRGGBB` format for backgrounds.
+
+### Current layers
+
+* **Layer 1** - color options that are mandatory.
+* **Layer 2** - common color options.
+* **Layer 3** - colors for specific control groups.
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