.loader {
  border: 16px solid #f3f3f3;
  border-radius: 50%;
  border-top: 16px solid blue;
  border-bottom: 16px solid red;
  width: 120px;
  height: 120px;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
  position: absolute;
  left:45%;
  top:40%;
  transform: translate(-50%, -50%);
}

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

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