.wpcf7-form label.error {
    color: #900;
    font-size: 11px;
    float: none;
    padding-left: 5px;
}

/*DON't show error msg */

.noErrorMsg.wpcf7-form label.error {
    display: none !important;
    height: 0px !important;
    width: 0px !important;
    overflow: hidden !important;
}

strong.invalid {
    color: red;
}

strong.valid {
    color: green;
}