WordPress Classic Editor Font

If you want a font for the WordPress Classic Editor (TinyMCE) that isn't the Georgia Font (strikingly similar to the Microsoft Times New Roman font), then do the following;

• Create a file in the ./themes/ directory, name it anything.css (suggestion: tinymce_font.css) with the following code;

  body#tinymce.wp-editor {
  font-family: Arial, Helvetica, sans-serif !important;
  }

• Then add the following code to the theme's (parent or child) functions.php file;