body {
    font-family: "Poetsen One", sans-serif;
    text-align: center;
    color: aliceblue;
    margin: 0;
    padding: 20px;
    background-image: url(../Pictures/Picsart_25-04-26_17-15-22-494.jpg);
    background-size: cover;
    background-attachment: fixed;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

h1 {
    margin-bottom: 20px;
}

#board {
    position: relative;
    height: 540px;
    width: 630px;
    background-color: blue;
    border: 10px solid navy;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    z-index: 7;

}

.tile {
    height: 70px;
    width: 70px;
    margin: 5px;
    background-color: rgb(0, 0, 0);
    border-radius: 50%;
    border: 5px solid navy;
    box-sizing: border-box;
}

.red-piece {
    background-color: red;
}

.yellow-piece {
    background-color: yellow;
}


#winnerBoard{
    width: 25rem;
    height: 10rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color:navy;
    font-size: 42px;
    border-radius: 75px;
    box-shadow: 0 0 21px #0000ff, 0 0 8px inset #000000;
    opacity: 0;
    transition: 0.5s;
}
#txt{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: fit-content;
    white-space: nowrap;
    text-shadow:
    1px 1px 5px #000,
   -1px -1px 5px #000;
}
@keyframes flash {
    0%, 100% { background-color: navy; }
    50% { background-color: #00f; }
}

#winnerBoard.win-effect {
    animation: flash 0.5s infinite;
}

.f2{
    position: fixed;
    bottom: -80px;
    left: 50%;
    transform: translateX(-50%);
    font-family: system-ui;
    text-align: center;
    color: #fff;
    padding: 20px;
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap; 
}
/* responsiveness */
@media(max-width: 767px) {
    #board {
        width: 85vw;
        height: auto;
        padding: 10px;
    }
    #winnerBoard{
        width: 20rem;
    }
    .tile {
        width: 10vw;
        height: 10vw;
        margin: 2px;
    }
}