html,
body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}


.loadingclass {
  background-color: white;
  font-size: 4ex;
  color: black;
  font-family:Georgia, Times, "Times New Roman",  serif
  border: 2px solid black;
  margin: 100px;
  padding: 20px;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;  
} 

html, body {
  height: 100%;
}