body {
  width: 100%;
  height: 100vh;
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(40%, #1a1a1a), color-stop(78%, #3e3e3e));
  background-image: -webkit-linear-gradient(top, #1a1a1a 40%, #3e3e3e 78%);
  background-image: -o-linear-gradient(top, #1a1a1a 40%, #3e3e3e 78%);
  background-image: linear-gradient(180deg, #1a1a1a 40%, #3e3e3e 78%); }

.model-viewer-machine {
  width: 100%;
  height: 100%; }