ruoyi-plus-soybean/src/styles/scss/loading.scss

@use 'sass:math';

$base-size: 100px;
$em-to-px: math.div($base-size, 2.5);
$loader-color-1: rgb(var(--error-color) / 75%);
$loader-color-2: rgb(var(--primary-color) / 75%);
$loader-color-3: rgb(var(--success-color) / 75%);
$loader-color-4: rgb(var(--warning-color) / 75%);

@function loader-size($em-value) {
  @return $em-to-px * $em-value;
}

/* From Uiverse.io by SchawnnahJ */
.loader {
  position: relative;
  width: loader-size(2.5);
  height: loader-size(2.5);
  transform: rotate(165deg);
}

.loader:before,
.loader:after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: loader-size(0.5);
  height: loader-size(0.5);
  border-radius: loader-size(0.25);
  transform: translate(-50%, -50%);
}

.loader:before {
  animation: before8 2s infinite;
}

.loader:after {
  animation: after6 2s infinite;
}

@keyframes before8 {
  0% {
    width: loader-size(0.5);
    box-shadow:
      loader-size(1) loader-size(-0.5) $loader-color-1,
      loader-size(-1) loader-size(0.5) $loader-color-2;
  }

  35% {
    width: loader-size(2.5);
    box-shadow:
      0 loader-size(-0.5) $loader-color-1,
      0 loader-size(0.5) $loader-color-2;
  }

  70% {
    width: loader-size(0.5);
    box-shadow:
      loader-size(-1) loader-size(-0.5) $loader-color-1,
      loader-size(1) loader-size(0.5) $loader-color-2;
  }

  100% {
    box-shadow:
      loader-size(1) loader-size(-0.5) $loader-color-1,
      loader-size(-1) loader-size(0.5) $loader-color-2;
  }
}

@keyframes after6 {
  0% {
    height: loader-size(0.5);
    box-shadow:
      loader-size(0.5) loader-size(1) $loader-color-3,
      loader-size(-0.5) loader-size(-1) $loader-color-4;
  }

  35% {
    height: loader-size(2.5);
    box-shadow:
      loader-size(0.5) 0 $loader-color-3,
      loader-size(-0.5) 0 $loader-color-4;
  }

  70% {
    height: loader-size(0.5);
    box-shadow:
      loader-size(0.5) loader-size(-1) $loader-color-3,
      loader-size(-0.5) loader-size(1) $loader-color-4;
  }

  100% {
    box-shadow:
      loader-size(0.5) loader-size(1) $loader-color-3,
      loader-size(-0.5) loader-size(-1) $loader-color-4;
  }
}

.loader {
  position: absolute;
  top: calc(50% - #{math.div(loader-size(2.5), 2)});
  left: calc(50% - #{math.div(loader-size(2.5), 2)});
}