src/app/loading.css

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
  display: none;
}

::-webkit-scrollbar-button:start:decrement,
::-webkit-scrollbar-button:end:increment {
  height: 30px;
  background-color: transparent;
}

::-webkit-scrollbar-track-piece {
  background-color: #3b3b3b;
  -webkit-border-radius: 16px;
}

::-webkit-scrollbar-thumb:vertical {
  height: 50px;
  background-color: #666;
  border: 1px solid #eee;
  -webkit-border-radius: 6px;
}

/* loading start */
.loading-spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  opacity: 1;
  transition: opacity .8s ease-out;
}

.loading-spinner.hidden {
  opacity: 0;
}

.loading-spinner>div {
  width: 30px;
  height: 30px;
  background: linear-gradient(90deg, #2870EA 10.79%, #1B4AEF 87.08%);

  border-radius: 100%;
  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(1.0);
  }
}