.bk-loader {
  margin: auto;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: 8px solid rgba(102,102,102, 0.2);
  border-right: 8px solid rgba(102,102,102, 0.2);
  border-bottom: 8px solid rgba(102,102,102, 0.2);
  border-left: 8px solid #666666;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-animation: bk-load8 1.1s infinite linear;
  animation: bk-load8 1.1s infinite linear;
  -webkit-transition: opacity 0.7s step-end;
  transition: opacity 0.7s step-end;
  position: absolute;
}
.bk-loader,
.bk-loader:after {
  border-radius: 50%;
  width: 70px;
  height: 70px;
}
@-webkit-keyframes bk-load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes bk-load8 {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}