html, body {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  background-color: #222222;
  font: 400 16px/1.5 "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}
* { box-sizing: border-box; }
a-assets * {
  display: none;
}
a-scene .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
}
a-scene.loaded .overlay {
  display: block;
  pointer-events: none;
}
.overlay > * {
  pointer-events: auto;
}

#logo {
  max-height: 30vh;
}
#logo.center {
  margin: auto;
  display: block;
}
#notice {
  width: 100%;
  left: 0;
  bottom: 0;
  position: absolute;
  padding: 1em;
  background: rgba(255.0, 255.0, 255.0, 0.5);
  box-shadow: 0 0 5px 5px rgba(0, 0, 0, 0.1);
  font-size: 1.1em;
  text-align: center;
}
#notice > div {
  padding-bottom: 0.5em;
}
.btn {
  display: inline-block;
  padding: 0.5em;
  border-radius: 5px;
  background-color: black;
  color: white;
  text-decoration: none;
  margin: 0 0.25em;
  cursor: pointer;
}
.btn-meta {
  background-color: #1674d4;
}
.btn-hmdlink {
  background-color: #1e1e1e;
}
#credit {
  position: absolute;
  font-size: 0.8em;
  color: #484848;
  margin: 5px;
  left: 0;
  bottom: 0;
}
#credit.backdrop {
  padding: 1em;
  margin: 0;
  background: rgba(255.0, 255.0, 255.0, 0.5);
}
#credit a {
  color: #484848;
}

.container {
  max-width: 960px;
  margin: auto;
  background-color: #eee;
  min-height: 400px;
  padding: 1em;
  margin-bottom: 3em;
}

#download {
  width: 60%;
  left: 20%;
  bottom: 4em;
  position: absolute;
  padding: 1em;
  background: rgba(255.0, 255.0, 255.0, 0.5);
  box-shadow: 0 0 5px 5px rgba(0, 0, 0, 0.1);
  font-size: 1.1em;
}

.btn-download {
  background-color: #5b9801;
}

@media (max-width: 960px) {
  .overlay #logo {
    margin: auto;
    display: block;
  }
}