control/src/components/loading.vue

<template>
  <div class="loading">
    <figure>
      <div class="dot white" />
      <div class="dot" />
      <div class="dot" />
      <div class="dot" />
      <div class="dot" />
    </figure>
  </div>
</template>

<style scoped>
.loading{
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 9;
    background: rgba(0, 0, 0, 0.7);
    font-size: 12px;
}
figure {
  position: absolute;
  margin: auto;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 6.25em;
  height: 6.25em;
  animation: rotate 2.4s linear infinite;
}
.white {
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  animation: flash 2.4s linear infinite;
  opacity: 0;
}
.dot {
  position: absolute;
  margin: auto;
  width: 2.4em;
  height: 2.4em;
  border-radius: 100%;
  transition: all 1s ease;
}
.dot:nth-child(2) {
  top: 0;
  bottom: 0;
  left: 0;
  background: #ff4444;
  animation: dotsY 2.4s linear infinite;
}
.dot:nth-child(3) {
  left: 0;
  right: 0;
  top: 0;
  background: #ffbb33;
  animation: dotsX 2.4s linear infinite;
}
.dot:nth-child(4) {
  top: 0;
  bottom: 0;
  right: 0;
  background: #99cc00;
  animation: dotsY 2.4s linear infinite;
}
.dot:nth-child(5) {
  left: 0;
  right: 0;
  bottom: 0;
  background: #33b5e5;
  animation: dotsX 2.4s linear infinite;
}

@keyframes rotate {
  0% {
    transform: rotate(0);
  }
  10% {
    width: 6.25em;
    height: 6.25em;
  }
  66% {
    width: 2.4em;
    height: 2.4em;
  }
  100% {
    transform: rotate(360deg);
    width: 6.25em;
    height: 6.25em;
  }
}

@keyframes dotsY {
  66% {
    opacity: 0.1;
    width: 2.4em;
  }
  77% {
    opacity: 1;
    width: 0;
  }
}
@keyframes dotsX {
  66% {
    opacity: 0.1;
    height: 2.4em;
  }
  77% {
    opacity: 1;
    height: 0;
  }
}

@keyframes flash {
  33% {
    opacity: 0;
    border-radius: 0%;
  }
  55% {
    opacity: 0.6;
    border-radius: 100%;
  }
  66% {
    opacity: 0;
  }
}
</style>