Focused links can be covered by the table of contents button on mobile

[tombye]

What should change

The table of contents button should be changed for smaller screens so it can't overlap links when they are focused.

User need

If you rely on the keyboard, you need to see what's in focus at all times. If a link gets hidden, it also breaks success criterion 2.4.11, Focus not obscured (minimum) and success criterion 2.4.12, Focus not obscured (enhanced).

For example, see the link to the 'GOV.UK kubernetes manual' on https://docs.publishing.service.gov.uk/ receiving focus while hidden:

[tombye]

We added a fix for this in #360 so I'm marking this as closed.