html, body { font-size: 18px; }

@media (orientation: landscape) {
  html, body { font-size: 16px; }
}
body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #131212;
  }
svg, 
canvas {
  max-width: 100%;
  max-height: 100%;
}

#modal-overlay {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  padding: 0;
  background-color: rgba(0,0,0,0.15);
  opacity: 0;
  font-family: monospace;
  text-align: center;
  pointer-events: none;
  transform: translate(0, 100vh);
  transition: transform 0.15s ease-in-out, opacity 0.25s ease-in-out;
  transition-delay: 0.25s, 0;
}
#modal-overlay.open {
  transform: translate(0, 0);
  opacity: 1;

}
#modal-window {
  position: absolute;
  top: 0;
  left: 0;
  background-color: white;
  color: #333;
  transform: translate(0, 0);
  padding: 2% 7%;
  border-radius: 0.25rem;
  pointer-events: all;
  box-shadow: 0 0 3em rgba(0, 0, 0, 0.25);
}
@media (orientation: landscape) {
  #modal-window {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

  }
}
#modal-window button {
  padding: 4px 12px;
  margin: 4px 8px;
  font-size: 1em;
  background: none;
  border: 1px solid #ccc;
  cursor: pointer;
}
#modal-window button:hover,
#modal-window button:focus {
  border-color: #333;
}

#modal-window #close-modal {
  position: absolute;
  top: 1em;
  right: 1em;
  font-size: 1.4em;
  border: none;
}