Modular Paralaxx with Full Width

Hello, maybe someone can help me. I’m grav beginner just trying something with the CMS. I would like to see a Modular page where a Paralaxx effect can be seen. The Paralaxx effect I present as follows.

.parallax { /* The image used */ background-image: url("http://****.jpeg"); /* Set a specific height */ height: 500px; /* Create the parallax scrolling effect */ background-attachment: fixed; background-position: center; background-repeat: no-repeat; background-size: cover; }

I get to see the Paralaxx effect, but not the full width.

Maybe someone has an idea. Thank you