body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #f0f0f0;
}

#tic-tac-toe {
  padding: 0;
  margin: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 5px;
}

#tic-tac-toe li {
  background-color: #33afaf;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: cursive;
  font-size: 80px;
  font-weight: bold;
  color: #fff;
  text-shadow: 5px 5px 5px #5555;
  transition: 0.5s;
}

#tic-tac-toe li::after {
  content: attr(data-value);
}

#tic-tac-toe li[data-value="X"] {
  background-color: #DB695A !important;
}

#tic-tac-toe li[data-value="O"] {
  background-color: #ECAF4E !important;
}

#tic-tac-toe li:hover {
  background-color: #426c70;
}

#alert {
  position: fixed;
  top: 0%;
  left: 0%;
  background-color: #fff9;
  width: 100%;
  height: 100%;
  display: none;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-family: monospace;
  font-size: xx-large;
  font-weight: bold;
}

#alert button {
  background-color: #ECAF4E;
  border: none;
  padding: 5px 20px;
  font-weight: bold;
  margin-top: 20px;
}