h1 {
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
}
.game {
  width: 500px;
  height: 500px;
  margin: 0 auto;
  background-color: #34495e;
  color: #fff;
  border: 6px solid #2c3e50;
  border-radius: 10px;
  display: grid;
  grid-template: repeat(3, 1fr) / repeat(3, 1fr);
}

.game > div {
  border: 6px solid #2c3e50;
  border-radius: 2px;
  font-family: Helvetica;
  font-weight: bold;
  font-size: 4em;
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 100%;
}
.start {
  background-color: #34495e;
  color: white;
  text-transform: uppercase;
  border: solid 1px;
  padding: 5px 10px;
  border-radius: 4px;
  text-align: center;
  align-items: center;
  justify-content: center;
  width: 150px;
  margin: 20px auto;
  font-weight: 600;
  letter-spacing: 4px;
}
.button {
  width: 200px;
  margin: 20px auto;
  text-align: center;
  align-items: center;
  justify-content: center;
  display: none;
}
.button .res {
  font-family: Arial, Helvetica, sans-serif;
  text-transform: uppercase;
  font-weight: 700;
  text-align: center;
}