.swal-button--loading {
  color: transparent;

  & ~ .swal-button__loader {
    opacity: 1;
  }
}

.swal-button__loader {
  position: absolute;
  height: auto;
  width: 43px;
  z-index: 2;
  left: 50%;
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
  text-align: center;
  pointer-events: none;
  opacity: 0;

  & div {
    display: inline-block;
    float: none;
    vertical-align: baseline;
    width: 9px;
    height: 9px;
    padding: 0;
    border: none;
    margin: 2px;
    opacity: 0.4;
    border-radius: 7px;
    background-color: rgba(255, 255, 255, 0.9);
    transition: background 0.2s;
    animation: swal-loading-anim 1s infinite;

    &:nth-child(3n+2) {
      animation-delay: 0.15s;
    }

    &:nth-child(3n+3) {
      animation-delay: 0.3s;
    }
  }
}

@keyframes swal-loading-anim {
  0%   { opacity: 0.4; }
  20%  { opacity: 0.4; }
  50% { opacity: 1.0; }
  100% { opacity: 0.4; }
}