Update the WordPress visual editor with a new font without a plugin

On your WordPress website the visual editor may be in a font that you do not like on there. You can update the font of the visual editor without a plugin if you add this code to your functions.php file. You may want to backup your WordPress website before you make updates to the functions.php file on it.

/**
 * Update the visual editor font
 *
 * @author WPSnacks.com
 * @link https://www.wpsnacks.com
 */
function change_editor_font(){
echo "<style type='text/css'>
#editorcontainer textarea#content {
font-family: YOURFONTHERE;
font-size: 14px;
color: #111;
}
</style>";
}
add_action("admin_print_styles", "the_editor_font");

You can then replace YOURFONTHERE with the font and the font size and font color that you want to use on it. Now if that works for you it would update the font of the visual editor on your WordPress website on there.