app/frontend/images/minimal-down.svg
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 24 24" width="24" height="24"><g class="nc-icon-wrapper" fill="#888888"><polyline fill="none" stroke="#888888" stroke-width="2" stroke-linecap="square" stroke-miterlimit="10" points="2,7 12,17 22,7 " transform="translate(0, 0)" stroke-linejoin="miter"></polyline></g></svg>