.loader {
  position: relative;
  width: 50px;
  height: 50px;
  background: linear-gradient(to left, #000, #222);
  border-radius: 50%;
  animation: animate 1s linear infinite;
  z-index: 1;
}
.loader::before {
  content: "8";
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2;
  position: absolute;
  background: white;
  text-align: center;
  color: #000;
  font-weight: 800;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  top: 40%;
  left: 40%;
  transform: translate(-50%, -50%);
}
@keyframes animate {
  0% {
    transform: rotate(0);
  }
  50% {
    transform: rotate(3.1415rad);
  }
  100% {
    transform: rotate(720deg);
  }
}