.loader {
  width: 148px;
  height: 148px;
  border-radius: 50%;
  margin: -64px auto 0;
  background-color: #ccc;
  background-image: radial-gradient(#4285f4 4px, #0000 0),
    radial-gradient(#ea4335 4px, #0000 0), radial-gradient(#fbbc05 4px, #0000 0),
    radial-gradient(#34a853 4px, #0000 0);
  background-position:
    24px center,
    8px center,
    -8px center,
    -24px center;
  position: relative;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.15) inset;
  animation: flash 1s linear infinite;
}

.loader::before,
.loader::after {
  content: "";
  position: absolute;
  border: 1px solid #ccc;
  border-top-color: #0000;
  left: 50%;
  top: 100%;
  transform: translateX(-50%);
  width: 16px;
  height: 18px;
  background: #fff;
}

.loader::before {
  width: 0px;
  height: 64px;
  transform: translate(-50%, 18px);
}

@keyframes flash {
  0% {
    background-image: radial-gradient(#4285f4 4px, #0000 0),
      radial-gradient(#ea4335 4px, #0000 0),
      radial-gradient(#fbbc05 4px, #0000 0),
      radial-gradient(#34a853 4px, #0000 0);
  }
  25% {
    background-image: radial-gradient(#ea4335 4px, #0000 0),
      radial-gradient(#fbbc05 4px, #0000 0),
      radial-gradient(#34a853 4px, #0000 0),
      radial-gradient(#4285f4 4px, #0000 0);
  }
  50% {
    background-image: radial-gradient(#fbbc05 4px, #0000 0),
      radial-gradient(#34a853 4px, #0000 0),
      radial-gradient(#4285f4 4px, #0000 0),
      radial-gradient(#ea4335 4px, #0000 0);
  }
  75% {
    background-image: radial-gradient(#34a853 4px, #0000 0),
      radial-gradient(#4285f4 4px, #0000 0),
      radial-gradient(#ea4335 4px, #0000 0),
      radial-gradient(#fbbc05 4px, #0000 0);
  }
  100% {
    background-image: radial-gradient(#4285f4 4px, #0000 0),
      radial-gradient(#ea4335 4px, #0000 0),
      radial-gradient(#fbbc05 4px, #0000 0),
      radial-gradient(#34a853 4px, #0000 0);
  }
}