fix demos

docs/source/_static/custom.css

+.wy-nav-content {
+    max-width: 80%;
+}
+.table table{ background:#b9b9b9} 
+.table table td{ background:#FFF} 

docs/source/conf.py

@@ -79,6 +79,9 @@ smartquotes = False
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 html_logo = '../images/paddle.png'
+html_css_files = [
+    'custom.css',
+]
 
 # -- Extension configuration -------------------------------------------------
 # numpydoc_show_class_members = False