.loader {
  position: relative;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(45deg, transparent, transparent 40%, #e5f403);
  animation: glow 2s linear infinite;
}
@keyframes glow {
  0% {
    transform: rotate(0deg);
    filter: hue-rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
    filter: hue-rotate(360deg);
  }
}
.loader::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  right: 3px;
  bottom: 3px;
  background: #212121;
  border-radius: 50%;
  z-index: 1000;
}
.loader::after {
  content: "";
  position: absolute;
  top: 0px;
  left: 0px;
  right: 0px;
  bottom: 0px;
  background: linear-gradient(45deg, transparent, transparent 40%, #e5f403);
  border-radius: 50%;
  z-index: 1000;
  z-index: 1;
  filter: blur(30px);
}