index.css

.loading-spinner-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  text-align: center;
  font-size: 10px;
}

.loading-spinner > div {
  background-color: #333;
  height: 100%;
  width: 6px;
  display: inline-block;
  animation: sk-bouncedelay 1.4s infinite ease-in-out both;
}

.loading-spinner .bounce1 {
  animation-delay: -0.32s;
}

.loading-spinner .bounce2 {
  animation-delay: -0.16s;
}

@keyframes sk-bouncedelay {
  0%,
  80%,
  100% {
    transform: scale(0);
  }

  40% {
    transform: scale(1);
  }
}

.loading-text {
  font-size: 18px;
  font-weight: bold;
  margin-top: 20px;
  text-align: center;
  color: #333;
}