Hi Manjul,

Thank you for you fast answer!

I found the way to manipulate all the styles that I needed.

First of all I disabled Helsinki (the Bootstrap that ServiceNow always include).

"You can disable it by creating a new glide property called "glide.ui.heisenberg.exclude" with a value of "view_content" ".

I found this message on the ServiceNow Community:

Disable Heisenburg Bootstrap

Secondly I created my own CSS Style Sheets and it worked!

Thanks