Markup
<div class="odyssey-inputgroup [modifier class]">
<label for="transactionId" class="odyssey-inputgroup__label">transaction ID</label>
<input id="transactionId" class="odyssey-inputgroup__input" type="text" name="transactionId" value="WS-5332-5533-2817">
<label for="transactionId" class="odyssey-inputgroup__error">that’s not a correct e-mail address</label>
</div>
Source:
src/forms/text_inputs.less, line 64