html,
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}

#game-container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#game-container>canvas {
  border-radius: 5px;
  max-width: 100%;
  max-height: 100%;
}

#left-panel {
  border-right: 2px solid #ddd;
}

#right-panel {
  padding-left: 2em;
  padding-right: 2em;
}