Check accessibility of arrow buttons

The interested/would use again (and equivalent opposite) could benefit from someone using the survey on a non-flagship phone (i.e.: small screen).
I found the buttons to be sometimes too small and too close between each other to act on them.

No source file or test is named. Start by reproducing the survey on a small-screen phone or Android Chrome and locate the interested/would-use-again arrow buttons; done means the buttons have usable touch targets and enough spacing to activate reliably without overlap.

Written by the indexing model from the issue text.