Text fields and drop-down menus are now 52 pixels tall. The button that submits a form is the same height as its fields, so Log in matches the email and password boxes above it.
Other buttons in a form, and the Continue with Google, LinkedIn and Apple buttons, are 48 pixels tall. Buttons in lists, toolbars and the bar at the top of each page are 40 pixels tall, or 44 pixels on a phone or touch screen.