<!doctype html>
<style>
p {
width: 100px;
height: 100px;
background-color: cyan;
border: 10px double red;
border-radius: 400px 0px 0px 400px / 20px 0px 0px 600px;
}
</style>
<p></p>
<!doctype html>
<style>
p {
width: 100px;
height: 100px;
background-color: cyan;
border: 10px double red;
border-radius: 400px 0px 0px 400px / 20px 0px 0px 600px;
}
</style>
<p></p>