my_digital_garden/quartz/components/Header.tsx

import { QuartzComponentConstructor, QuartzComponentProps } from "./types"

function Header({ children }: QuartzComponentProps) {
  return (children.length > 0) ? <header>
    {children}
  </header> : null
}

Header.css = `
header {
  display: flex;
  flex-direction: row;
  align-items: center;
  margin: 2em 0;
}

header h1 {
  margin: 0;
  flex: auto;
}
`

export default (() => Header) satisfies QuartzComponentConstructor