body {
  font-family: sans-serif;
  text-align: center;
  background: #0b3d91;
  color: white;
  margin: 0;
  padding: 0;
}
#menu, #game {
  padding: 20px;
}
button {
  padding: 10px 20px;
  font-size: 16px;
  margin: 10px;
}
.board {
  display: grid;
  grid-template-columns: repeat(10, 30px);
  gap: 2px;
  justify-content: center;
  margin: 10px;
}
.cell {
  width: 30px;
  height: 30px;
  background-color: #1e90ff;
  border: 1px solid #fff;
}
.ship {
  background-color: #444;
}
.hit {
  background-color: red;
}
.miss {
  background-color: lightgray;
}
.controls {
  margin-top: 10px;
}