body {
  color: transparent;
  background-color: #fff;
  font-family: sans-serif;
  overflow: hidden;

  display: flex;
  justify-content: center;
  align-items: center;

  margin: 0;
  padding: 0;
}

#loader-wrapper {
  background-color: #fff;
  z-index: 10; 
  display: flex; 
  position: absolute; 
  top: 0px; 
  left: 0; 
  width: 100%; 
  height: 100%; 
  justify-content: center; 
  align-items: center;
}

.loader {
  display: inline-block;
  width: 20px;
  height: 20px;
}

.loader:after {
  content: " ";
  display: block;
  opacity: 0.5;
  width: 20px;
  height: 20px;
  margin: 0px;
  border-radius: 50%;
  border: 2px solid #333;
  border-color: #333 transparent #333 #333;
  animation: loader 2s linear infinite;
}

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