body {
  font-family: helvetica;
  width:100%;
  height:100%;
  overflow: hidden;
}

#main-canvas {
  height: 100vh;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  background-size: contain;
  position: absolute;
}

.loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  color: chartreuse;
  font-size: 40px;
  font-weight: bold;
  animation: swing .5s linear infinite alternate;
  transform-origin: 50%;
}

@keyframes swing {
  0% {
    transform: translate(-50%,-50%) rotate(10deg);
  }
  50% {
    transform: translate(-50%,-50%) rotate(0);
  }
  100% {
    transform: translate(-50%,-50%) rotate(-10deg);
  }
}

.lds-hourglass {
  position: absolute;
  top: 40%;
  left: 45%;
  width: 100px;
  height: 100px;
  color: chartreuse;
}
.lds-hourglass:after {
  content: " ";
  display: block;
  border-radius: 50%;
  width: 0;
  height: 0;
  margin: 8px;
  box-sizing: border-box;
  border: 32px solid #0f0;
  border-color: #0f0 transparent #0f0 transparent;
  animation: lds-hourglass 1.2s infinite;
}
@keyframes lds-hourglass {
  0% {
    transform: rotate(0);
    animation-timing-function: cubic-bezier(0.55, 0.055, 0.675, 0.19);
  }
  50% {
    transform: rotate(900deg);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }
  100% {
    transform: rotate(1800deg);
  }
}