The Emacs theme Tomorrow Night Deepblue is a beautiful deep blue variant of
the Tomorrow Night theme, which is renowned for its elegant color
palette that is pleasing to the eyes.

The Tomorrow Night Deepblue features a deep blue background color that
creates a calming atmosphere. The contrasting colors make it easy to
distinguish between different elements of your code. The
tomorrow-night-deepblue theme is also a great choice for programmer who miss
the blue themes that were trendy a few years ago.