body {
  text-align: center;
}

table.center {
  margin-left:auto;
  margin-right:auto;
}

td {
  border: 1px solid black;
}

.selected {
  background-color: black;
}

.gameOption {
  height: 40px;
  width: 300px;
  font-family: sans-serif;
  font-size: 20px;
  font-weight: bold;
  display: none;
}

#changeSpeedButton {
  height: 40px;
  width: 200px;
  font-family: sans-serif;
  font-size: 20px;
  font-weight: bold;
}

#gameSpeed {
  height: 30px;
  width: 70px;
  font-family: sans-serif;
  font-size: 20px;
  font-weight: bold;
  text-align: center;
}