MagicMirror/modules/default/alert/templates/alert.njk

{% if imageUrl or imageFA %}
    {% set imageHeight = imageHeight if imageHeight else "80px" %}
    {% if imageUrl %}
        <img src="{{ imageUrl }}"
             height="{{ imageHeight }}"
             style="margin-bottom: 10px" />
    {% else %}
        <span class="bright fas fa-{{ imageFA }}"
              style="margin-bottom: 10px;
                     font-size: {{ imageHeight }}"></span>
    {% endif %}
    <br />
{% endif %}
{% if title %}
    <span class="thin dimmed medium">{{ title if titleType == 'text' else title | safe }}</span>
{% endif %}
{% if message %}
    {% if title %}<br />{% endif %}
    <span class="light bright small">{{ message if messageType == 'text' else message | safe }}</span>
{% endif %}