* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: #333;
  display: flex;
  align-items: center;
  font-size: 3rem;
  flex-direction: column;
  color: white;
}

.title {
  margin: 20px;
}

.subtext {
  margin-bottom: 10px;
  font-size: 1.5rem;
  color: #ccc;
}

.board {
  display: inline-grid;
  padding: 10px;
  grid-template-columns: repeat(var(--size), 60px);
  grid-template-rows: repeat(var(--size), 60px);
  gap: 4px;
  background-color: #777;
}

.board > * {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  color: white;
  border: 2px solid #bbb;
  user-select: none;
}

.board > [data-status="hidden"] {
  background-color: #bbb;
  cursor: pointer;
}
.board > [data-status="mine"] {
  background-color: red;
  cursor: pointer;
}
.board > [data-status="number"] {
  background-color: none;
  cursor: pointer;
}
.board > [data-status="marked"] {
  background-color: yellow;
  cursor: pointer;
}