border-radius:40px;

border-radius:40px 40px 20px 20px;

border-top-left-radius    :20px;
border-top-right-radius   :40px;
border-bottom-left-radius :60px;
border-bottom-right-radius:80px;

border-top-left-radius    :40px 20px;
border-top-right-radius   :40px 20px;
border-bottom-left-radius :20px 40px;
border-bottom-right-radius:20px 40px;