Do you want to make changes to your site with custom CSS but don’t have a custom CSS area built into your website? Well you can add it your WordPress website with ease thanks to this plugin – Simple Custom CSS.
So first go to your WordPress dashboard and go to Plugins > Add New then type in Simple Custom CSS and hit Install Now, then activate your plugin.
Once activated you will find the plugin under Appearance > Custom CSS. Now all you need to do is paste in your custom CSS code below the first line and hit Update Custom CSS.