Czech Republic
2:3
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 6 4">
<title>Flag of Czech Republic</title>
<path d="M0,0L3,2L0,4Z" fill="#006abb"/>
<path d="M0,0h6v2L3,2Z" fill="#fff"/>
<path d="M0,4L3,2h3v2Z" fill="#ff402b"/>
</svg>