Radial-gradient safari does not work

.ticket { /* Style for "btn" */ width: 279px; height: 65px; -webkit-border-radius: 31px; -moz-border-radius: 31px; border-radius: 31px; background-image: -o-linear-gradient( top, #004ea3 0%, #2d91ff 99%, #2d91ff 100%), -o-linear-gradient(top, #242b47 0%, #181d33 100%); background-image: -webkit-linear-gradient( top, #004ea3 0%, #2d91ff 99%, #2d91ff 100%), -webkit-linear-gradient(top, #242b47 0%, #181d33 100%); background-image: -moz-linear-gradient( top, #004ea3 0%, #2d91ff 99%, #2d91ff 100%), -moz-linear-gradient(top, #242b47 0%, #181d33 100%); background-image: linear-gradient( top, #004ea3 0%, #2d91ff 99%, #2d91ff 100%), linear-gradient( top, #242b47 0%, #181d33 100%); border: none; color: #fff; } .ticket:hover { background-image: -o-radial-gradient(circle 232px at 56.15% 56.93%, #2d91ff 0%, #2d91ff 1%, #004ea3 100%), -o-linear-gradient( top, #242b47 0%, #181d33 100%); background-image: -webkit-radial-gradient(circle 232px at 56.15% 56.93%, #2d91ff 0%, #2d91ff 1%, #004ea3 100%), -webkit-linear-gradient( top, #242b47 0%, #181d33 100%); background-image: -moz-radial-gradient(circle 232px at 56.15% 56.93%, #2d91ff 0%, #2d91ff 1%, #004ea3 100%), -moz-linear-gradient(to top, #242b47 0%, #181d33 100%); background-image: radial-gradient(circle 232px at 56.15% 56.93%, #2d91ff 0%, #2d91ff 1%, #004ea3 100%), linear-gradient(to top, #242b47 0%, #181d33 100%); } 

 <button class='ticket'>ticket</button