body {
  background-color: hsl(30, 2%, 94%);
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: hsl(240, 4%, 21%);
  }

  .start-loader {
    border-color: hsl(158, 43%, 63%) transparent;
  }

  .start-loader::after {
    border-color: hsl(158, 41%, 41%) transparent;
  }
}

.start-loader {
  z-index: -1;
  width: 48px;
  height: 48px;
  border: 3px solid hsl(158, 42%, 50%);
  border-radius: 50%;
  display: inline-block;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
}

.start-loader::after {
  content: "";
  box-sizing: border-box;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid;
  border-color: hsl(158, 41%, 25%) transparent;
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}