more docs and diagrams

docs/examples/guide/styles/padding02.py

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+from textual.app import App, ComposeResult
+from textual.widgets import Static
+
+
+TEXT = """I must not fear.
+Fear is the mind-killer.
+Fear is the little-death that brings total obliteration.
+I will face my fear.
+I will permit it to pass over me and through me.
+And when it has gone past, I will turn the inner eye to see its path.
+Where the fear has gone there will be nothing. Only I will remain."""
+
+
+class PaddingApp(App):
+    def compose(self) -> ComposeResult:
+        self.widget = Static(TEXT)
+        yield self.widget
+
+    def on_mount(self) -> None:
+        self.widget.styles.background = "purple"
+        self.widget.styles.width = 30
+        self.widget.styles.padding = (2, 4)
+
+
+app = PaddingApp()
+if __name__ == "__main__":
+    app.run()