.action {
  position: relative;
  display: inline-block;
}

/* スピナーの見た目 */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid #ccc;
  border-top: 3px solid #333;
  border-radius: 50%;
  animation: spin 1s linear infinite;

  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  pointer-events: none;
}

.hidden {
  display: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}