<style>
.dp-mask {
  --dp-mask-bg: #fff; 
  --dp-mask-spinner-track: #e3e3e3; 
  --dp-mask-spinner-active: #09f; 
  --dp-mask-fade-duration: 0.35s;

  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2147483647;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--dp-mask-bg);
  margin: 0;
  padding: 0;
  border: 0;
  box-sizing: border-box;
  opacity: 1;
  transition: opacity var(--dp-mask-fade-duration) ease;
}

.dp-mask--fade-out {
  opacity: 0;
  pointer-events: none;
}

.dp-mask-spinner {
  width: 40px;
  height: 40px;
  box-sizing: border-box;
  border: 4px solid var(--dp-mask-spinner-track);
  border-top-color: var(--dp-mask-spinner-active);
  border-radius: 50%;
  animation: dp-mask-spin 1s linear infinite;
}

@keyframes dp-mask-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
</style>

<div class="dp-mask">
    <div class="dp-mask-spinner"></div>
</div>

<script>

</script>