x/website: show header on mobile devices

[loveboat]

What is the URL of the page with the issue?

https://go.dev/tour

and all subsequent /tour pages

Description

On desktop the header h2 is clearly visible on the tour screens:

However, on mobile devices, the header is obscured due to incorrect padding:

As viewed here via devtools:

What did you see happen?

The header was hidden when viewed on a mobile device

What did you expect to see?

The header displayed on mobile as it is on desktop

[gopherbot]

Change https://go.dev/cl/613675 mentions this issue: tour: show header on mobile devices

[cagedmantis]

cc @golang/tools-team