loading : 三个圆圈

<template>
  <div id="load-background">
    <div id="three-circle"></div>
  </div>
</template>

<script>

export default {
  name: '',
  data() {
    return {}
  },
  mounted() {
  },
  methods: {}
}
</script>

<style lang="scss" scoped>
#load-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 999999;
  background: #0d0d1bcf;
}

#three-circle {
  display: block;
  position: relative;
  left: 50%;
  top: 50%;
  width: 150px;
  height: 150px;
  margin: -75px 0 0 -75px;

  border-radius: 50%;

  border: 3px solid transparent;
  border-top-color: red;

  animation: spin 2s linear infinite;
  z-index: 1001;
}

#three-circle:before {
  content: "";
  position: absolute;
  top: 5px;
  left: 5px;
  right: 5px;
  bottom: 5px;
  border-radius: 50%;
  border: 3px solid transparent;
  border-top-color: greenyellow;
  animation: spin 3s linear infinite;
}

#three-circle:after {
  content: "";
  position: absolute;
  top: 15px;
  left: 15px;
  right: 15px;
  bottom: 15px;
  border-radius: 50%;
  border: 3px solid transparent;
  border-top-color: blue;
  animation: spin 1.5s linear infinite;
}


@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>