main.css

* {
  margin: 0;
  padding: 0;
}
body {
  background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),
    url("./background.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  min-height: 100vh;
}

h1 {
  padding-top: 20px;
  text-align: center;
}

h1,
label {
  color: white;
}

input {
  margin-bottom: 20px;
}

#inputs {
  display: flex;
  flex-direction: column;
  margin: 20px 30%;
}

#game {
  display: flex;
  justify-content: center;
}

#start-game {
  background-color: white;
  padding: 2px;
  margin-top: 20px;
  cursor: pointer;
}

#game-area {
  display: grid;
  background-color: white;
  text-align: center;
}

#start-game,
#game-area,
.mine-section {
  border: 1px solid black;
}

.mine-section {
  height: 20px;
  width: 20px;
}