.wpcf7 form span.wpcf7-not-valid-tip {
    float: left;
    margin-top: 5px;
    font-weight: 700;
    color: rgba(0, 0, 0, .8);
}

.wpcf7 form .wpcf7-response-output {
    margin: 0 0 1em;
    padding: 0.5em 1em;
    float: left;
    width: 100%;
}

.wpcf7 form.invalid .wpcf7-response-output {
    border-color: #fff900;
}