@collab-ui/core/scss/components/input/examples/error.html

Cisco Collab UI CSS Framework

   <div class="cui-input-group medium-6 columns error">
     <label class="cui-label" for="errorInput">Label</label>
     <input class="cui-input" id="errorInput" type="text" placeholder="Placeholder" value="Error">
     <div class="cui-input__messages">
       <div class="message">This is where the error message would be.</div>
     </div>
   </div>