.rounded_box {
    background-color: orange;
    width: 200px;
    border-radius: 50px;
    border-top-left-radius: 10px;
    border-top-right-radius: 20px;
    border-bottom-right-radius: 30px;
    border-bottom-left-radius: 40px;
    -moz-border-bottom-left-radius: 40px;   /* for older version of firefox */
    -webkit-border-bottom-left-radius: 40px;   /* for older version of chrome */
}