3.3 #Forms.Errors Errors
Error styles are applied when .has-error or .invalid classes match.
Example
Something went wrong!
Markup
<div class="cs-form-group">
<label class="field-label">Name</label>
<input type="text" class="cs-text-box w-100 has-error">
<span class="invalid">Something went wrong!</span>
</div>
Source:
3_Form/forms.less
, line 45