html {
  background-color:black;
  color:white;
}

html, body {
  margin: 0px;
  border: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#canvas {
  position: absolute;

  display: block;
	top: 50%; left: 50%;
	transform: translate(-50%, -50%);
	margin:auto;

  width:100%;
  height:100%;
  /*max-width:800px;*/
  /*max-height:600px;*/
}

#loading_page {
  position:fixed;
  top:0;
  left:0;
  width: 100%;
  height: 100%;
  z-index:1;
}

.hbox {
  display:flex;
  flex-direction:row;
}

.vbox {
  display:flex;
  flex-direction:column;
}

.flex {
  flex:1;
}

#loading {
  display: inline-block;
  width: 50px;
  height: 50px;
  border: 3px solid rgba(255,255,255,.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
  -webkit-animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { -webkit-transform: rotate(360deg); }
}

@-webkit-keyframes spin {
  to { -webkit-transform: rotate(360deg); }
}