.error {
    .form-date {
        .form-group {
            .invalid-input {
                border: 4px solid $error-colour;
            }
        }
    }

}

.error {
    .form-group {
        .invalid-input {
            border: 4px solid $error-colour;
        }
    }
}

Allow any field to be an invalid-input, not just dates
Allow any field to be an invalid-input, not just dates
