irma-website/_includes/svg.html

{% if include.id %}
<svg{% if include.class %} class="{{ include.class }}"{% endif %}{% if include.width %} width="{{ include.width }}"{% endif %}{% if include.height %} height="{{ include.height }}"{% endif %}>
  <use xlink:href="{{ "svg/sprite.symbol.svg" | relative_url }}#{{ include.id }}" />
</svg>
{% endif %}