Hi Luc,
You can add an extra rule (to your answers.scss file) to target the width of the search bar and nav. It would look something like this:
.Answers-navWrapper {
.Answers-container {
max-width: 80%
}
}
I would also recommend adding breakpoints, so the search bar and nav remain full width on mobile. Let us know if that works for you!
Thanks,
Rose