Why do my Grid elements are not recognized?

Cuéntanos qué está pasando:
Describe tu problema en detalle aquí.
I’ve been trying to add CSS Grid to my fourth project ( Technical Documentation Page) but for some reason, the main container is recognized, but my aside and main aren’t. I can’t made my project full responsive because of this. Im trying to put my whole navbar above my main part of the body.
Help, please :frowning:

Tu código hasta el momento

Información de tu navegador:

El agente de usuario es: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Desafío: Construye una página de documentación técnica

Enlaza al desafío:

I might be wrong, but I believe position fixed / absolute won’t work with grid because fixed and absolute takes the element out of the document flow. Grid works on document flow.

Thank you very much.