Creating these pseudo-classes is essential for viewing and modifying the properties of certain elements that do not have them by default. Once created, they will allow you to better control the style and behavior of those components. You can then adjust them to your specific needs to achieve the desired result.

Step by step:

1. Access your Brick Builder and click on the 'States' option in the top menu.

   

2. Click in the input field and create the following pseudo-classes

   • after
   • before
   • last-child
   • nth-child(n)