form #field_email.error:before {
    content: 'Invalid email address format';
    position: absolute;
    font-size: .813rem;
    padding: 0 .313rem;
    color: red;
    top: -.438rem;
    left: .438rem;
    line-height: 100%;
    background: #fff;
}
form #field_email.error input, 
form #field_email.error span {
    border-color: red;
    color: red;
}