.form_field input {
    border: 1px solid;
}
.form_field.error .input::placeholder {
    color: red!important;
}

.form_field.error .input::-moz-placeholder {
    color: red!important;
}

.form_field.error .input::-webkit-input-placeholder {
    color: red!important;
}
.form_field.error span {
    color: red!important;
}
.form_field.error span > a {
    color: red!important;
}