:root {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

html, body {
    min-height: 100dvh;
}

#center-contain {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100dvh;
}

#main-game {
    display: grid;
    grid-template: repeat(3, 80px) / repeat(3, 80px);
    padding: 10px;
    gap: 10px;
}

.box {
    border: 1px solid #000;
    box-sizing: border-box;
    background-color: #e2e2e2;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;
    transition: 0.1s background-color ease-in-out,
                0.1s transform ease-in-out;
}

.box:hover {
    background-color: #f8f8f8;
    transform: scale(1.03);
}

.box:active {
    background-color: #efefef;
    transform: scale(0.99);
}

.popup {
    background: #00000044;
    backdrop-filter: blur(6px);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100dvh;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
}

.popup-content {
    border: 2px solid #000000aa;
    padding: 25px;
    border-radius: 10px;
    background: #ccc;
    color: #000;
}

.dismiss-button {
    padding: 5px;
    border-radius: 8px;
    background-color: #fff;
    color: #000;
    border: 1px solid #000;
    cursor: pointer;
}



form input[type="text"], form button[type="submit"] {
    padding: 6px;
    font-size: 1rem;
    display: block;
    outline: none;
    border-radius: 10px;
    border: 1px solid #000;
    margin: auto;
}

form button[type="submit"] {
    cursor: pointer;
}