<p>
<label class="valid">Valid</label>
<input class="is-valid" type="text" placeholder="Text Input" value="Valid content">
</p>
<p>
<label class="valid">Valid</label>
<input class="is-valid" type="text" placeholder="Text Input" value="Valid content">
</p>
/* No context defined for this component. */
Updated :focus to use $brand-secondary, which is currently Blue. Needs checking.
Added the already existing class is-valid (green outline). This will probably need to be added via JS on-the-fly.