#loading {
   display: grid;
   position: absolute;
   width: 100%;
   height: 100%;
   background: rgba(255, 255, 255, 0.5);
   z-index: 1;
   align-items: center;
   text-align: center;
   font-weight: bold;
   font-size: 5em;
   opacity: 1;
   transition: opacity 1s;
   pointer-events: none;
 }

 #loading.hidden {
  opacity: 0;
 }

 #map {
   height: 100%;
 }

 html,
 body {
   height: 100%;
   margin: 0;
   padding: 0;
 }