vender prefix

border-radius: 15px 0px;

-webkit-border-radius: 15px 0px;  // sapari, chrome

-moz-border-radius: 15px 0px;    // firefox

-o-border-radius: 15px 0px;        // opera

-ms-border-radius: 15px 0px;      // IE

background: -prefix-radial-gradient(circle, white, blur);