* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Arial", sans-serif;
  background-color: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  flex-direction: column;
}

#heading {
  font-size: 3rem;
  font-weight: bold;
  margin-bottom: 20px;
  text-align: center;
  color: #333;
}

#container {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 10px;
  margin-bottom: 20px;
}

.block {
  width: 100px;
  height: 100px;
  background-color: #b9b7b7;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  font-weight: bold;
  color: #302f2f;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
  border-radius: 5px;
}

.block:hover {
  background-color: #d3d3d3;
  transform: scale(1.1);
}

.block:active {
  transform: scale(1);
}

button {
  font-size: 1.2rem;
  padding: 10px 20px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  margin-top: 20px;
}

button:hover {
  background-color: #0056b3;
}

button:active {
  background-color: #004085;
}

#reset:focus {
  outline: none;
}

body.win-x {
  background-color: #bcff6f9c;
}

body.win-o {
  background-color: #fc2d2d8c;
}

body.tie {
  background-color: #ffa754d0;
}

.block[style*="pointer-events: none"] {
  cursor: not-allowed;
}

.difficulties > button {
  background-color: #da4848;
}

.difficulties > button:hover {
  background-color: #7a2828;
}

.difficulties > button.active {
  background-color: #7a2828;
}