Note that the
width value can be given as a number representing the value in pixels or as a percent representing the size relative to the parent element containing the editor.
config.width = 850; config.width = '75%';
height value defines the height of CKEditor editing area and can be given in pixels or em. Percent values are not supported.
config.height = 500; config.height = '25em'; config.height = '300px';