How I can do that a modal window work?

Hi Christian Acosta!
Please try to do these steps like documentation shows:
1. Create a modal -content.css
2. Add it to the container
3. Press Preview: you should see a content with shadow
4. Create a modal-overlay.css
5. Put the first container into another
6. Add the modal-overlay.css to the second container
7. Press Preview: you should see a soma similar a "pop up" window
8. Add to your form a button with name "open"
9. For this button do this steps:
Lets add a button and configure the Action property with Add to collection
then bind the modals variable to the Collection property.
10. Press Preview: you should see an "open" button and when you push on it you should see the "pop up" windows
11. Then follow the steps to create the "close" buttom