* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial;
  font-size: 10px;
}

.container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 100vw;
  align-items: center;
  justify-content: center;
  background-color: #000;

}

#board {
  display: flex;
  flex-wrap: wrap;
  width: 40rem;
}

.tile {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  border: 0.1rem solid #000;
  background-color: #fff;
}

.tile > div {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}

.hidden {
  background-color: #b5b5b5;
  cursor: pointer;
}

.flagged {
  cursor: pointer;
}

.flagged::before {
  content: '🚩';
}

.safe {
  pointer-events: none;
}

.landmine {
  background-color: #ff0000;
}

.landmine-green {
  background-color: #06c100;
}

.landmine::before {
  content: '💣';
}

.board-sizes {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
  width: 34em;
}

.button {
  width: 10rem;
  height: 4rem;
  background-color: #fff;
  margin-top: 4rem;
  border-radius: 2px;
  border: none;
  outline: none;
  cursor: pointer;
  font-size: 1.6rem;
}

.button:active {
  background-color: #b5b5b5;
}