html, body {
  height: 100%;
}

.card {
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.game-canvas {
  width: 100%;
}

.keyboard-shortcut-help {
  margin: 4px 12px;
}

.keyboard-shortcut-help th {
  white-space: nowrap;
}

.keyboard-shortcut-help td, .keyboard-shortcut-help th {
  padding: 6px;
  vertical-align: middle;
}

.keyboard-shortcut-key {
  display: inline-block;
  min-width: 1em;
  min-height: 1em;
  padding: 4px 6px;
  font-weight: normal;
  text-align: center;
  text-decoration: none;
  border-radius: 3px;
  box-shadow: inset 0 -1px 0 rgba(71, 87, 120, 0.08);
  user-select: none;
  color: #4B4D51;
  background: #F7F7F7;
  border: 1px solid #C7CCD9;
}