Refactor buttons.

components/PageHeader.js

@@ -0,0 +1,12 @@
+import React, { Children } from 'react';
+import styles from './PageHeader.module.css';
+
+export default function PageHeader({ children }) {
+  const [firstChild, ...otherChildren] = Children.toArray(children);
+  return (
+    <div className={styles.header}>
+      <div className={styles.title}> {firstChild}</div>
+      {otherChildren && <div>{otherChildren}</div>}
+    </div>
+  );
+}