for_client/public/plugins/css/loading.css

.loading {
  display: flex;
  width: 100%;
  height: 100%;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background-color: #f4f7f9
}

.loading .loading-wrap {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  -webkit-transform: translate3d(-50%, -50%, 0);
  transform: translate3d(-50%, -50%, 0);
  justify-content: center;
  align-items: center;
  flex-direction: column
}

.loading .dots {
  display: flex;
  padding: 98px;
  justify-content: center;
  align-items: center
}

.loading .loading-title {
  display: flex;
  font-weight: bold;
  margin-top: 30px;
  font-size: 34px;
  color: rgba(0, 0, 0, .85);
  justify-content: center;
  align-items: center
}


.dot {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 48px;
  margin-top: 30px;
  font-size: 32px;
  transform: rotate(45deg);
  box-sizing: border-box;
  animation: antRotate 1.2s infinite linear
}

.dot i {
  position: absolute;
  display: block;
  width: 20px;
  height: 20px;
  background-color: #0065cc;
  border-radius: 100%;
  opacity: .3;
  transform: scale(.75);
  animation: antSpinMove 1s infinite linear alternate;
  transform-origin: 50% 50%
}

.dot i:nth-child(1) {
  top: 0;
  left: 0
}

.dot i:nth-child(2) {
  top: 0;
  right: 0;
  -webkit-animation-delay: .4s;
  animation-delay: .4s
}

.dot i:nth-child(3) {
  right: 0;
  bottom: 0;
  -webkit-animation-delay: .8s;
  animation-delay: .8s
}

.dot i:nth-child(4) {
  bottom: 0;
  left: 0;
  -webkit-animation-delay: 1.2s;
  animation-delay: 1.2s
}

@keyframes antRotate {
  to {
    -webkit-transform: rotate(405deg);
    transform: rotate(405deg)
  }
}

@-webkit-keyframes antRotate {
  to {
    -webkit-transform: rotate(405deg);
    transform: rotate(405deg)
  }
}

@keyframes antSpinMove {
  to {
    opacity: 1
  }
}

@-webkit-keyframes antSpinMove {
  to {
    opacity: 1
  }
}