/* Shorthand */
border-radius: 20px 20px 20px 20px / 20px 20px 20px 20px

/* Longhand */
border-top-left-radius: 20px 20px
border-top-right-radius: 20px 20px
border-bottom-right-radius: 20px 20px
border-bottom-left-radius: 20px 20px