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

Cisco Collab UI CSS Framework

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