.loader {
  width: 20px;
  height: 20px;
  border: 10px solid #bfbfbf;
  border-radius: 50%;
  display: block;
  position: relative;
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
  margin: 10px auto;
}
.loader::after {
    content: '';  
  box-sizing: border-box;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid transparent;
    border-bottom-color: #8f150b;
}
    
@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}