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No.221 · Authentication

Number Match

Two-step sign-in by number matching, with both screens in view. The laptop shows a number; the phone beside it lights up with the request and three numbers. Pick the right one and a pulse crosses from phone to screen and you're in; pick wrong and a fresh number is issued. The request expires on a ring.

The prompt

The design brief behind this component — reuse it to regenerate, remix, or explain it.

Build a number-matching push MFA screen with a live phone mock beside it. Layout: a grid of the sign-in card, a short dotted "wire", and a phone (rounded bezel, glass with a gradient wallpaper, a dynamic island and a lock-screen clock). Under 760px it stacks with a vertical wire. Card: "Approve on your phone", one line of instructions, and the two-digit number large in tabular figures inside a 120-unit SVG ring that runs down with the request's time to live (pathLength 1, dashoffset 1 − remaining, linear 1s steps). The number is announced politely and re-animates in (scale 0.7, blur 6px → crisp, slight overshoot) whenever it changes. Below: "Expires in 54s" and "Use another way to sign in". Phone: about a second after a request is issued, a frosted notification (backdrop blur 18px) springs down with the app icon, "Are you trying to sign in?", the device and place, "Tap the number on your screen", three number buttons — one correct, two random, shuffled — and "No, it's not me". The phone is a labelled group, and its buttons are only tabbable while the request is open. Outcomes: the correct number → the notification gives way to a green Approved check on the phone, a pulse runs twice along the wire from phone to screen (a gradient dash, 700ms), and the card shows "Signed in" with a drawn check and focus on the heading. A wrong number outlines it in red, turns the ring and message red ("That didn't match — here's a new number"), then issues a fresh number, choices and clock. "No, it's not me" or "Use another way" stops the attempt; the clock reaching zero gives "Request expired" with "Send a new request". Paper and Night.

Notes

Interaction
Wait for the notification on the phone, then tap the number shown on the screen. Try a wrong number, or “No, it’s not me”.
Motion
Notification springs in (420ms); the number re-enters with blur and overshoot; ring counts down linearly; approval pulse 700ms × 2; checks draw 500ms.
Accessibility
The number and its status are polite live regions; the phone is a labelled group of real buttons, tabbable only while a request is open; results move focus to their heading. Colour is never the only signal — every state is spelled out. Reduced motion removes the transitions.
Responsive
Side by side from 760px; stacked below, with the wire turning vertical.
On touch
Identical on touch; the phone buttons are 48px tall.

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301 components