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

.bg {
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
}

.bg img {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  min-width: 50%;
  min-height: 50%;
  width: auto;
}

#content canvas {
  position: absolute;
  width:100%;
  height:100%;
}

.d-none {
  display: none;
}