You must have tried out Gmail’s new Preview(Dense) theme. This is the upcoming preview version of Gmail’s cleaner and more modern looking interface. If you have already activated the Preview or Dense Preview versions in Gmail, you must have noticed that there are some extra whitespaces as compared to the earlier themes. Well, many of you may like it but having extra whitespaces along the top and side may not appeal some of you. If you want to have a more compact look with lesser whitespace for Gmail’s Dense Preview theme, you can have it using Stylish or Greasemonkey.
For stylish, you can use this style to remove the extra whitespace and make the layout look more compact. This style reduces the whitespaces in the mail list area, left menu list etc.
With these scripts and styles, you can easily remove extra whitespace in Gmail’s Preview or Preview (Dense) theme.