@keyframes pulse_box_shadow {
  0% {
    opacity: 1;
  }
  70% {
    opacity: 0.4;
  }
  100% {
    opacity: 1;
  }
}

.btn--ajax + .ajax-progress {
  display: none;
}

.btn--ajax.js-loading {
  animation: pulse_box_shadow 1s infinite;
}