@import url('https://fonts.googleapis.com/css?family=Press+Start+2P&display=swap');
*, *::after, *::before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
:root {
  --tile-size: 100px;
  --mark-size: calc(var(--tile-size) * .9);
}
body{
  background-color: aquamarine;
  font-family: 'Press Start 2P', sans-serif;
  font-size: 16px;
}
h1{
  font-family: 'Press Start 2P', sans-serif;
  text-align: center;
  border: 1px solid rgb(0 0 0 / 38%);
  margin: 20px auto;
  padding: 10px;
  width: 60%;
}
.board {
  background-color: aliceblue;
  width: 80%;
  height: 500px;
  display: grid;
  grid-template-columns: repeat(3, auto);
  margin: 25px auto;
  box-shadow: 17px 36px 135px 86px rgb(0 0 0 / 38%), 0 4px 20px 0 rgb(0 0 0 / 37%);
}
.tile {
  width: 100%;
  border: 1px solid black;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  cursor: pointer;
}
.tile:first-child,
.tile:nth-child(2),
.tile:nth-child(3) {
  border-top: none;
}

.tile:nth-child(3n + 1) {
  border-left: none;
}

.tile:nth-child(3n + 3) {
  border-right: none;
}

.tile:last-child,
.tile:nth-child(8),
.tile:nth-child(7) {
  border-bottom: none;
}
.fill-o,
.fill-x{
  cursor: not-allowed;
}
.tile.fill-x::before,
.tile.fill-x::after,
.tile.fill-o::before {
  background-color: black;
}
.tile.fill-x::before,
.tile.fill-x::after{
  content: '';
  position: absolute;
  width: calc(var(--mark-size) * .15);
  height: var(--mark-size);
}
.tile.fill-x::before {
  transform: rotate(45deg);
}
.tile.fill-x::after{
  transform: rotate(-45deg);
}
.tile.fill-o::before,
.tile.fill-o::after {
  content: '';
  position: absolute;
  border-radius: 50%;
}

.tile.fill-o::before{
  width: var(--mark-size);
  height: var(--mark-size);
}

.tile.fill-o::after {
  width: calc(var(--mark-size) * .7);
  height: calc(var(--mark-size) * .7);
  background-color: white;
}
.game-over::after,.draw::after{
  content: "It's a Draw!";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
 text-align: center;
 padding-top: 200px;
  color: #000;
  font-size: 5rem;
}
.winning-message {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, .9);
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 3rem;
  flex-direction: column;
  text-align: center;
}

.winning-message button {
  font-size: 2rem;
  background-color: white;
  border: 1px solid black;
  padding: .25em .5em;
  cursor: pointer;
   font-family: 'Press Start 2P', sans-serif;
}

.winning-message button:hover {
  background-color: black;
  color: white;
  border-color: white;
}

.winning-message.show {
  display: flex;
}