Add the settings for right margin.
Add the settings for right margin.

Issue #38

zkendall/WordBinder,codex8/text-app,codex8/text-app,modulexcite/text-app,codex8/text-app,wearefractal/extension-boiler,zkendall/WordBinder,modulexcite/text-app,l3dlp/text-app,l3dlp/text-app,zkendall/WordBinder,l3dlp/text-app,modulexcite/text-app