main.css

main.css

/* coding: utf-8 */

#main-content {
  padding-top: 50px;
}

#puzzle {
  border-collapse: collapse;
  border: solid 1px #ccc;
  font-size: x-large;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}
#puzzle td {
  text-align: center;
  border: solid 1px #ccc;
  width: 70px;
  height: 70px;
}
#puzzle .mouseOver {
  background: #eee;
}