<!DOCTYPE HTML> <html> <style type="text/css"> div { width: 64px; height: 64px; border: 64px solid blue; } </style> <body> <div style="height: 0; border-bottom: 0; border-top-left-radius: 64px; border-top-right-radius: 64px;"></div> <div style="height: 64px; border-width: 0 64px;"></div> <div style="height: 0; border-top: 0; border-bottom-left-radius: 64px; border-bottom-right-radius: 64px;"></div> </body> </html>