How to add custom CSS styles to your website
In case you need to add custom CSS styles to your website in order to modify the style of a subscription form, for example, we recommend you do so by using the Simple Custom CSS plugin.
Install and activate the plugin on your WordPress
Once the plugin is installed, you'll see a new page called "Custom CSS" under the Appearance menu.
By clicking on it you'll be able to add your custom CSS which will be loaded on the front-end of your website's theme. That's it!