more docs

docs/examples/styles/margin.py

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+from textual.app import App
+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 MarginApp(App):
+    CSS = """
+   
+    Static {
+        margin: 4 8;  
+        background: blue 20%;  
+    }    
+    
+    """
+
+    def compose(self):
+        yield Static(TEXT)
+
+
+app = MarginApp()