loader.css

body {
  margin: 0;
}

#loading-bg {
  width: 100%;
  height: 100%;
  background: #fff;
  display: block;
  position: absolute;
}
.loading-logo {
  position: absolute;
  left: calc(50% - 45px);
  top: 40%;
}
.loading {
  position: absolute;
  left: calc(50% - 35px);
  top: 50%;
  width: 55px;
  height: 55px;
  border-radius: 50%;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  border: 3px solid transparent;
}
.loading .effect-1,
.loading .effect-2 {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 3px solid transparent;
  border-left: 3px solid rgba(121, 97, 249, 1);
  border-radius: 50%;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

.loading .effect-1 {
  animation: rotate 1s ease infinite;
}
.loading .effect-2 {
  animation: rotateOpacity 1s ease infinite 0.1s;
}
.loading .effect-3 {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 3px solid transparent;
  border-left: 3px solid rgba(121, 97, 249, 1);
  -webkit-animation: rotateOpacity 1s ease infinite 0.2s;
  animation: rotateOpacity 1s ease infinite 0.2s;
  border-radius: 50%;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

.loading .effects {
  transition: all 0.3s ease;
}

@keyframes rotate {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(1turn);
    transform: rotate(1turn);
  }
}
@keyframes rotateOpacity {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
    opacity: 0.1;
  }
  100% {
    -webkit-transform: rotate(1turn);
    transform: rotate(1turn);
    opacity: 1;
  }
}