added color reference and docs

docs/guide/styles.md

@@ -5,7 +5,7 @@ Textual provides a large number of *styles* you can use to customize how your ap
 
 ## Styles object
 
-Every widget class in Textual provides a `styles` object which contains a number of writable attributes. Styles define the position and size of a widget, in addition to color, text style, borders, alignment and much more.
+Every widget class in Textual provides a `styles` object which contains a number of writable attributes. You can write to any of these attributes and Textual will update the screen accordingly.
 
 Let's look at a simple example which sets the styles on the `screen` (a special widget that represents the screen).
 
@@ -13,13 +13,21 @@ Let's look at a simple example which sets the styles on the `screen` (a special
 --8<-- "docs/examples/guide/styles/screen.py"
 ```
 
-The first line sets `screen.styles.background` to `"darkblue"` which will change the background color to dark blue. There are a few other ways of setting color which we will explore later.
+The first line sets [background](../styles/background.md) to `"darkblue"` which will change the background color to dark blue. There are a few other ways of setting color which we will explore later.
 
-The second line sets `screen.styles.border` to a tuple of `("heavy", "white")` which tells Textual to draw a white border with a style of `"heavy"`. Running this code will show the following:
+The second line sets [border](../styles/border.md) to a tuple of `("heavy", "white")` which tells Textual to draw a white border with a style of `"heavy"`. Running this code will show the following:
 
 ```{.textual path="docs/examples/guide/styles/screen.py"}
 ```
 
+
+
+## Colors
+
+The [color](../styles/color.md) property set the color of text on a widget. The [background](..styles/background/md) property sets the color of the background (under the text).
+
+
+
 ## Box Model
 
 
@@ -29,7 +37,6 @@ The second line sets `screen.styles.border` to a tuple of `("heavy", "white")` w
 
 
 
-
 TODO: Styles docs
 
 - What are styles