* {
  box-sizing: border-box;
  font-family: sans-serif;
  margin: 0;
}

.app {
  width: 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 50px;
  margin: 3rem auto;
}

.heading {
  text-align: center;
  line-height: 1.6;
}

.grid {
  width: 350px;
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.row {
  display: flex;
  gap: 25px;
}

.square {
  width: 100px;
  height: 100px;
  border: 2px solid gray;
}

.reset-button {
  background-color: rgba(78, 241, 241, 0.851);
  border: none;
  border-radius: 5px;
  padding: 1rem;
  font-size: large;
  font-weight: bold;
}

.reset-button:hover {
  background-color: rgba(174, 240, 240, 0.851);
}

.clicked-X {
  color: blue;
  text-align: center;
  font-size: 5rem;
  align-content: center;
}

.clicked-O {
  color: red;
  text-align: center;
  font-size: 5rem;
  align-content: center;
}

.winning-square {
  background-color: greenyellow;
}