Added compose event, more color docs

docs/examples/guide/styles/colors.py

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+from textual.app import App, ComposeResult
+from textual.widgets import Static
+
+
+class WidgetApp(App):
+    def compose(self) -> ComposeResult:
+        self.widget = Static("Textual")
+        yield self.widget
+
+    def on_mount(self) -> None:
+        self.widget.styles.background = "darkblue"
+        self.widget.styles.border = ("heavy", "white")
+
+
+app = WidgetApp()
+if __name__ == "__main__":
+    app.run()

docs/examples/guide/styles/colors01.py

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+from textual.app import App, ComposeResult
+from textual.color import Color
+from textual.widgets import Static
+
+
+class ColorApp(App):
+    def compose(self) -> ComposeResult:
+        self.widget1 = Static("Textual One")
+        yield self.widget1
+        self.widget2 = Static("Textual Two")
+        yield self.widget2
+        self.widget3 = Static("Textual Three")
+        yield self.widget3
+
+    def on_mount(self) -> None:
+        self.widget1.styles.background = "#9932CC"
+        self.widget2.styles.background = "hsl(150,42.9%,49.4%)"
+        self.widget2.styles.color = "blue"
+        self.widget3.styles.background = Color(191, 78, 96)
+
+
+app = ColorApp()
+if __name__ == "__main__":
+    app.run()

docs/examples/guide/styles/colors02.py

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+from textual.app import App, ComposeResult
+from textual.color import Color
+from textual.widgets import Static
+
+
+class ColorApp(App):
+    def compose(self) -> ComposeResult:
+        self.widgets = [Static(f"Textual {n+1}") for n in range(10)]
+        yield from self.widgets
+
+    def on_mount(self) -> None:
+        for index, widget in enumerate(self.widgets, 1):
+            widget.styles.background = Color(191, 78, 96, index * 0.1)
+
+
+app = ColorApp()
+if __name__ == "__main__":
+    app.run()

docs/examples/guide/styles/widget.py

@@ -0,0 +1,17 @@
+from textual.app import App, ComposeResult
+from textual.widgets import Static
+
+
+class WidgetApp(App):
+    def compose(self) -> ComposeResult:
+        self.widget = Static("Textual")
+        yield self.widget
+
+    def on_mount(self) -> None:
+        self.widget.styles.background = "darkblue"
+        self.widget.styles.border = ("heavy", "white")
+
+
+app = WidgetApp()
+if __name__ == "__main__":
+    app.run()