frontend/src/components/LoadingSpinner/LoadingSpinner.vue

<script setup lang="ts">
defineProps<{
  isShow: boolean;
}>();
</script>

<template>
  <Transition name="fade">
    <div v-if="isShow" class="loading-spinner">
      <div class="bounce1"></div>
      <div class="bounce2"></div>
      <div class="bounce3"></div>
    </div>
  </Transition>
</template>

<style scoped>
.fade-enter-active,
.fade-leave-active {
  transition: opacity 2.5s ease;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}

.loading-spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.loading-spinner > div {
  width: 30px;
  height: 30px;
  background: linear-gradient(90deg, #2870ea 10.79%, #1b4aef 87.08%);

  border-radius: 100%;
  display: inline-block;
  -webkit-animation: sk-bouncedelay 1.4s infinite ease-in-out both;
  animation: sk-bouncedelay 1.4s infinite ease-in-out both;
}

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

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

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

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

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

  40% {
    -webkit-transform: scale(1);
    transform: scale(1);
  }
}
</style>