moar docs

docs/styles/max_width.md

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+# Max-width
+
+The `max-width` rule sets a maximum width for a widget.
+
+## CSS
+
+```sass
+
+/* Set a maximum width of 10 cells */
+max-width: 10;
+
+/* Set a maximum width of 25% of the screen width */
+max-width: 25vh;
+```
+
+## Python
+
+```python
+# Set the maximum width to 10 cells
+widget.styles.max_width = 10
+
+# Set the maximum width to 25% of the screen width
+widget.styles.max_width = "25vw"
+
+```