*,
*::before,
*::after {
  box-sizing: border-box;
}
:root {
  --cell-size: 100px;
  --mark-size: calc(var(--cell-size) * 0.9);
  --mainColor: black;
}
body {
  margin: 0;
}
.board {
  width: 100vw;
  height: 100vh;
  display: grid;
  justify-content: center;
  justify-items: center;
  align-content: center;
  align-content: center;
  grid-template-columns: repeat(3, auto);
}
.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border: 1px solid black;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  cursor: pointer;
}
.cell.x,
.cell.o {
    cursor: not-allowed;
}
.cell:first-child,
.cell:nth-child(2),
.cell:nth-child(3) {
  border-top: none;
}
.cell:nth-child(3n + 1) {
  border-left: none;
}
.cell:nth-child(3n) {
  border-right: none;
}
.cell:last-child,
.cell:nth-child(7),
.cell:nth-child(8) {
  border-bottom: none;
}
.cell.x::before,
.cell.x::after,
.cell.o::before {
    background-color: black;
}
.board.x .cell:not(.x):not(.o):hover::before,
.board.x .cell:not(.x):not(.o):hover::after,
.board.o .cell:not(.x):not(.o):hover::before {
    background-color: lightgray
}

.cell.x::before,
.cell.x::after,
.board.x .cell:not(.x):not(.o):hover::before,
.board.x .cell:not(.x):not(.o):hover::after {
    content: '';
    width: calc(var(--mark-size)  * .15);
    height: var(--mark-size);
    position: absolute;
}
.cell.x::before,
.board.x .cell:not(.x):not(.o):hover::before {
    transform: rotate(45deg);
}
.cell.x::after,
.board.x .cell:not(.x):not(.o):hover::after {
    transform: rotate(-45deg);
}

.cell.o::before,
.cell.o::after,
.board.o .cell:not(.x):not(.o):hover:before,
.board.o .cell:not(.x):not(.o):hover:after {
    content: '';
    border-radius: 50%;
    position: absolute;
}
.cell.o::before,
.board.o .cell:not(.x):not(.o):hover:before {
    width: calc(var(--mark-size));
    height: calc(var(--mark-size));
}
.cell.o::after,
.board.o .cell:not(.x):not(.o):hover:after {
    width: calc(var(--mark-size) * .7);
    height: calc(var(--mark-size) * .7);
    background-color: white;
}

/* here goes my stuff  */

.winning-msg {
    text-transform: capitalize;
    position: fixed;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, .7);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 10px;
    display: none;
}
.winning-msg.show {
    display: flex;
}
.winning-msg .win-msg-text{
    color: white;
    font-size: 5rem;
    margin: 0;
    
}
.winning-msg button {
    font-size: 3rem;
    padding: .25em .5em;
    outline: none;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
.winning-msg button:hover {
    background-color: black;
    color: white;
}