.spinner {
  --size: 30px;
  --first-clr: #005bba;
  --second-clr: #fed500;
  width: 100px;
  height: 100px;
  position: relative;
}

.spinner::before,
.spinner::after {
  content: "";
  width: var(--size);
  height: var(--size);
  border: 6px solid var(--first-clr);
  position: absolute;
  top: 50%;
  left: calc(var(--size));
  transform: translate(-50%, -50%);
  animation: kf-spin 1s linear infinite;
  border-radius: 50% 80% 50% 70%;
  box-sizing: border-box;
}

.spinner::after {
  top: 50%;
  left: calc(var(--size) * 2);
  border: 6px solid var(--second-clr);
  animation: kf-spin 1s linear infinite reverse;
}

@keyframes kf-spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}