Don't use red for suggestions.

app.py

@@ -100,7 +100,7 @@ html_out = ''
 for span in spans:
     is_different = span['token'] != span['most_likely_token']
     html_out += '<span style="color: {color}" title="{title}">{orig_token}</span>'.format(
-        color="red" if is_different else "black",
+        color="blue" if is_different else "black",
         title=html.escape(span["most_likely_token"]).replace('\n', ' '),
         orig_token=html.escape(span["token"]).replace('\n', '<br>')
     )