Pure CSS spinner loader

spinner.html

<style>
loader {
  left: 50%;
  top: 50%;
  position: fixed;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%); }
  .loader #spinner {
    box-sizing: border-box;
    stroke: #FB791A;
    stroke-width: 3px;
    -webkit-transform-origin: 50%;
            transform-origin: 50%;
    -webkit-animation: line 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite, rotate 1.6s linear infinite;
            animation: line 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite, rotate 1.6s linear infinite; }

@-webkit-keyframes rotate {
  from {
    -webkit-transform: rotate(0);
            transform: rotate(0); }
  to {
    -webkit-transform: rotate(450deg);
            transform: rotate(450deg); } }

@keyframes rotate {
  from {
    -webkit-transform: rotate(0);
            transform: rotate(0); }
  to {
    -webkit-transform: rotate(450deg);
            transform: rotate(450deg); } }

@-webkit-keyframes line {
  0% {
    stroke-dasharray: 2, 85.964;
    -webkit-transform: rotate(0);
            transform: rotate(0); }
  50% {
    stroke-dasharray: 65.973, 21.9911;
    stroke-dashoffset: 0; }
  100% {
    stroke-dasharray: 2, 85.964;
    stroke-dashoffset: -65.973;
    -webkit-transform: rotate(90deg);
            transform: rotate(90deg); } }

@keyframes line {
  0% {
    stroke-dasharray: 2, 85.964;
    -webkit-transform: rotate(0);
            transform: rotate(0); }
  50% {
    stroke-dasharray: 65.973, 21.9911;
    stroke-dashoffset: 0; }
  100% {
    stroke-dasharray: 2, 85.964;
    stroke-dashoffset: -65.973;
    -webkit-transform: rotate(90deg);
            transform: rotate(90deg); } }
</style>
<div class="loader">
    <svg viewBox="0 0 32 32" width="32" height="32">
      <circle id="spinner" cx="16" cy="16" r="14" fill="none"></circle>
    </svg>
  </div>