Updated CSS Customizations (markdown)

CSS-Customizations.md

@@ -7,6 +7,13 @@ If you want to use the excellent Lato font everywhere, add
 body { font-family: 'Lato', sans-serif; }
 ```
 
+## More spacious theme
+
+To increase spacing, use
+```css
+tr.bufferline { line-height: 1.4; }
+```
+
 ## Disable readmarker
 
 If you don't like the readmarker, kill it with