.splashscreen,
.spinner {
  width: 100%;
  height: 100%;
}
.spinner:before {
  content: '';
  box-sizing: border-box;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 60px;
  height: 60px;
  margin-top: -30px;
  margin-left: -30px;
  border-radius: 50%;
  border: 5px solid  #e31837;
  border-top-color: rgba(0,0,0,0);
  animation: spinner .6s linear infinite;
}
@keyframes spinner {
  to {transform: rotate(360deg);}
}