Scribe.js/static/partials/elements/blocks.html

<div 
    class="block"
    ng-class="{'block--date' : type == 'date', 'block--file': forceFile}"
    style="background: {{ color() }}"
    >
    <p class="block__message block__message--top" ng-if="messageTop">{{messageTop}}</p>
    <p class="block__message block__message--middle" ng-if="message">{{message}}</p>
    <p class="block__message block__message--bottom" ng-if="messageBottom">{{messageBottom}}</p>
</div>