html {
  height: 100%;
  background: black;
  color: white;
  font-size: 40px;
}

label, label::before {
  display: block;
  width: 50px;
  height: 50px;
  cursor: pointer;
}

label::before {
  text-align: center;
}

body {
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

main {
  margin: auto;
  color: white;
}

input { display:none; label: pointer-events: none; }

label { pointer-events: none; }

input ~ main label::before { content: "O"; }
#won { display: initial; user-select: none; }
input[data-safe]:not(:checked) ~ footer #won { display: none; }
input[data-safe]:not(:checked) ~ main label { pointer-events: initial; }

#lost { display: none; user-select: none ; }
input[data-mine]:checked ~ footer #lost { display: initial; }
input[data-mine]:checked ~ main label { pointer-events: none; }

footer {
  display: flex;
  justify-content: center;
}

#lost, #won {
  position: absolute;
  top: 10px;
}