By default LiveWhale’s WYSIWYG editor TinyMCE loads certain styles that you can add to with other configuration options. To skip the base CSS (content_basic.css in the inspector) in LiveWhale 2.23+ you can enable

$_LW->CONFIG['WYSIWYG_SKIP_BASIC_CSS']=true;

in your global.config.php file. This is useful if you wish to more fully style the WYSIWYG editor without needing as many overrides.