node server + separate client folder

client/src/common/components/countdown/Countdown.jsx

@@ -0,0 +1,18 @@
+import styles from './Countdown.module.css';
+
+function display(seconds) {
+  const format = (val) => `0${Math.floor(val)}`.slice(-2);
+  const hours = seconds / 3600;
+  const minutes = (seconds % 3600) / 60;
+
+  if (hours < 1) return [minutes, seconds % 60].map(format).join(':');
+  else return [hours, minutes, seconds % 60].map(format).join(':');
+}
+
+export default function Countdown({ time, small }) {
+  return (
+    <div className={small ? styles.countdownClockSmall : styles.countdownClock}>
+      {time === null ? '- -:- -' : display(time * 60)}
+    </div>
+  );
+}