.rounded_box {
    background-color: orange;
    width: 200px;
    border-radius: 50px;
    background-image: linear-gradient(to top /*to bottom*/, #04507b, #00a2ff);
    background-image: linear-gradient(to top, #04507b, #0072b4, #018ad9, #00a2ff);
    background-image: linear-gradient(to top, #04507b 40%, #0072b4, #018ad9, #00a2ff);
}