Sizing every tap target for a thumb instead of a mouse

You need

A page with more than one pair of icon-only interactive controls sitting close together, such as two action buttons in a card footer and a close icon beside a menu icon in the header, each pair laid out in a flex or grid container whose gap value you can edit.

Not covered

Choosing an accessible name for an icon-only button, and removing the brief delay before a tap counts as a click on mobile, both real but separate problems from sizing the tap area itself.