.spinner {
  position: absolute;
  z-index: 97;
  height: 100%;
  width: 100%;
  background-color: #fff;
  opacity: 0.6;
  display: none;
}

.spinner:before {
  left: 50%;
  top: 40%;
  margin-left: -43px;
  border: 2px solid #3699FF;
  border-right: 2px solid transparent;
}