.spinner {
  width: 20px;
  height: 20px;
  position: relative;
}

.double-bounce1,
.double-bounce2 {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #333;
  opacity: 0.6;
  position: absolute;
  top: 0;
  left: 0;
  animation: bounce 2s infinite ease-in-out;
}

.double-bounce2 {
  animation-delay: -1s;
}

@keyframes bounce {
  0%,
  100% {
    transform: scale(0);
  }
  50% {
    transform: scale(1);
  }
}