body {
  font-family: "Arial", sans-serif;
  background-color: #cccccc;
}
section {
  text-align: center;
}
.game--restart {
  border-radius: 5px;
  background-color: #78f683;
}
.game--container {
  display: grid;
  grid-template-columns: repeat(3, auto);
  width: 306px;
  margin: 50px auto;
}
.cell {
  font-family: "Permanent Marker", cursive;
  width: 100px;
  height: 100px;
  box-shadow: 0 0 0 5px #333333;
  border: 1px solid #333333;
  cursor: pointer;
  line-height: 100px;
  font-size: 60px;
  background: #78f683;
  background: -webkit-linear-gradient(right, #78f683, #1ed097);
  background: -moz-linear-gradient(right, #78f683, #1ed097);
  background: linear-gradient(to left, #78f683, #1ed097);
  border-radius: 5px;
}