border-radius: 50px

border-radius: 150px 0px

border-radius: 100px 50px 100px 50px

border-radius: 50%

border-radius: 50% 50% 0 0

border-radius: 50% 0 50% 0

border-radius: 50% 50% 50% 0

border-radius: 40px/20px

border-radius: 100px/50px

border-radius: 15%/20%

border-radius: 60px 60px 90px 90px / 110px 110px 30px 30px