.action {
  position: relative;
  width: 100%;
  max-width: 300px;
  margin: 20px auto;
  text-align: center;
}

.sbspinner {
  position: absolute;
  width: 24px;
  height: 24px;
  border: 3px solid #ccc;
  border-top: 3px solid #333;
  border-radius: 50%;
  animation: spin 1s linear infinite;

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

.hidden {
  display: none !important;
}

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