One of the first things you’ll probably want to change about Emacs is the default face. This controls the foreground color, the background color, the font, and other attributes. For example, many graphical environments give Emacs a background of white. If you prefer a black background (which can be less tiring during long periods of use), you can change the background to black my customizing the default face.
To change the background color and other attributes, use the command
M-x customize-face, and specify
default as the face to customize. Change the attributes and the sample text will reflect your settings. When you are satisfied, select Save for future sessions. Your changes will be saved to ~/.emacs and reloaded the next time you start the editor.