Page Header width as the container box

In the simple custom CSS (I have just added again the code if you can access and see how it looks)

Can you try the updated code?: https://docs.generatepress.com/article/adjusting-the-featured-images/#removing-the-outside-padding-spacing

Right now It works, thank you! If you look it you will see different size of pictures, is there any way that all the images have the same size (Occupying the same space)?

You mean the height? You can use the sizing options in Customize > Blog > Featured Images to make sure the images are the same height.

Great!!!

Thank you soooo much for your help. Really appreciated

You're welcome :)