guacamole/src/main/frontend/src/app/clipboard/templates/guacClipboard.html

<div>
    <textarea ng-show="isActive" class="clipboard active"></textarea>
    <textarea ng-show="!isActive" class="clipboard inactive" ng-focus="setActive()">{{'CLIENT.TEXT_CLIPBOARD_AWAITING_FOCUS' | translate}}</textarea>
</div>