Implementing multiple color mode switching is so simple! In HTML we can easily add the switching color style sheets as alternative style sheets.
But when it comes to Drupal there is a slight change. Here is how we can implement multiple color switches in Drupal theme. We normally include style sheets in .info file and we cannot specify 'alternative stylesheets' just like in HTML. So here we need a module called Drupal 'Styleswitcher'. By enabling this Drupal module you will get the option 'styleswitcher' to add alternative style sheets.
For more details just follow these steps.