* {
  margin: 0; padding: 0;
  box-sizing: border-box;
  font-family: Roboto, sans-serif;
  transition-timing-function: ease-in-out;
}

html {
  background: #121212;
}

body {
          user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

#xr-button {
  display: block;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  border: 0;
  background: transparent;
  color: rgba(255,255,255,.6);
  transition: color .15s;
  cursor: pointer;
}

#xr-button:hover {
  color: rgba(255,255,255,.87);
  transition: color .2s;
}

#xr-button:disabled {
  color: rgba(255,255,255,.6);
  cursor: default;
}

#xr-button-text {
  margin-top: 1vw;
  font-size: 2.5vw;
  text-transform: uppercase;
  font-weight: bold;
}

#vr-icon {
  position: relative;
  width: 32vw;
  height: 18vw;
}

#vr-icon::before,
#vr-icon::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  display: block;
  height: 100%;
  width: 100%;
  background-image: url("/vr-icon.svg");
  background-size: 32vw;
}

#vr-icon::before {
  opacity: .6;
}

#vr-icon::after {
  background-position: 0 18vw;
  opacity: 0;
  transition: opacity .2s;
}

#xr-button:hover:not(:disabled) #vr-icon::after {
  transition: opacity .25s;
  opacity: 1;
}

#xr-button:disabled #vr-icon::before {
  opacity: .38;
}