.square {
  width: 100px;
  height: 100px;
  background: #eee;
  font-size: 800%;
  line-height: 1em;
  text-align: center;

  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  -user-select: none;
}

#tictactoe table, th, td {
  border: 1px solid black;
}

#instruction {
  font-size: 300%;
}

#postgame_survey_text {
  width: 100%;
  height: 300px;
}

#postgame_survey {
  text-align: center;
}