.form_caja {
    width: 524px;
    padding-top: 8px;
    padding-bottom: 15px;
    margin: 0 auto 20px auto;
    background: #f2f2f2;


     border-radius: 15px;

    -moz-border-radius: 15px;

    -webkit-border-radius: 15px;
    /* color: #446bb3; */
}