+−<!doctype html> +−<html><head> +−<title>Curved stripe border (HTML)</title> +−<style> +−body { margin: 0 } +−div { +− box-sizing: border-box; +− width: 180px; +− height: 180px; +− border: 30px double black; +− border-radius: 60px / 40px; +− margin: 20px; +−} +−</style> +−</head><body> +−<div></div> +−</body></html>