panel/assets/arc_spinner.svg

<svg xmlns="http://www.w3.org/2000/svg" style="margin: auto; background: none; display: block; shape-rendering: auto;" viewBox="0 0 100 100" preserveAspectRatio="xMidYMid">
  <circle cx="50" cy="50" fill="none" stroke="{color}" stroke-width="10" r="35" stroke-dasharray="164.93361431346415 56.97787143782138">
    <animateTransform attributeName="transform" type="rotate" repeatCount="indefinite" dur="1s" values="0 50 50;360 50 50" keyTimes="0;1"></animateTransform>
  </circle>
</svg>