body {
  font-family: Tahoma, sans-serif;
  background-color: #008080;
  margin: 0;
  padding: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.window {
  background: #c0c0c0;
  border: 2px outset #fff;
  width: max-content;
  box-shadow: 4px 4px 10px rgba(0,0,0,0.5);
}

.title-bar {
  background: linear-gradient(to right, #000080, #3366cc);
  color: white;
  padding: 5px 10px;
  display: flex;
  justify-content: space-between;
  font-weight: bold;
  border-bottom: 2px solid #000;
}

.window-content {
  padding: 10px;
  background: #e0e0e0;
}

.top-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.counter {
  background: black;
  color: red;
  font-family: 'Courier New', monospace;
  font-size: 20px;
  padding: 2px 8px;
  border: 2px inset #999;
  width: 50px;
  text-align: center;
}

#face {
  font-size: 20px;
  background: #e0e0e0;
  border: 2px outset #999;
  padding: 3px 8px;
  cursor: pointer;
}

#saper-board {
  display: grid;
  gap: 2px;
  user-select: none;
}

#saper-board button {
  width: 30px;
  height: 30px;
  font-weight: bold;
  border: 2px outset #fff;
  background-color: #c0c0c0;
  cursor: pointer;
  font-family: monospace;
  font-size: 16px;
  padding: 0;
}

#saper-board button.revealed {
  background-color: #e0e0e0;
  border: 2px inset #999;
  cursor: default;
}