bolt.new/packages/bolt/app/components/header/Header.tsx

import { useStore } from '@nanostores/react';
import { ClientOnly } from 'remix-utils/client-only';
import { chatStore } from '~/lib/stores/chat';
import { classNames } from '~/utils/classNames';
import { OpenStackBlitz } from './OpenStackBlitz.client';

export function Header() {
  const chat = useStore(chatStore);

  return (
    <header
      className={classNames(
        'flex items-center bg-bolt-elements-background-depth-1 p-5 border-b h-[var(--header-height)]',
        {
          'border-transparent': !chat.started,
          'border-bolt-elements-borderColor': chat.started,
        },
      )}
    >
      <div className="flex items-center gap-2 z-logo text-bolt-elements-textPrimary">
        <a href="/" className="text-2xl font-semibold text-accent flex items-center">
          <span className="i-bolt:logo-text?mask w-[46px] inline-block" />
        </a>
      </div>
      <div className="ml-auto flex gap-2">
        <ClientOnly>{() => <OpenStackBlitz />}</ClientOnly>
      </div>
    </header>
  );
}