style.css

body {
    margin: 0;
    font-family: 'Dosis', sans-serif;
    background-color: #F6F6F6;
    color: #1A1A1A;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #0070BB;
    color: #FFFFFF;
    padding: 20px;
    text-align: center;
    position: relative;
}

header img {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: auto;
}

h1 {
    margin: 0;
    font-size: 2.5em;
}

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    position: absolute;
    top: 20px;
    right: 20px;
    cursor: pointer;
}

.burger-icon {
    width: 30px;
    height: 4px;
    background-color: #FFFFFF;
}

.mobile-nav {
    display: none;
    background-color: #E31837;
    position: absolute;
    top: 60px;
    right: 0;
    width: 200px;
    text-align: center;
    padding: 10px 0;
}

.mobile-nav a {
    color: #FFFFFF;
    text-decoration: none;
    font-size: 1.2em;
    padding: 10px 0;
    display: block;
}

.mobile-nav a:hover {
    text-decoration: underline;
}

main {
    flex: 1;
    padding: 20px;
    text-align: center;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(15, 40px);
    grid-template-rows: repeat(15, 40px);
    gap: 2px;
    justify-content: center;
    margin: 20px auto;
}

.cell {
    width: 40px;
    height: 40px;
    background-color: #FFFFFF;
    border: 1px solid #1A1A1A;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    cursor: pointer;
}

.cell:hover {
    background-color: #F6F6F6;
}

.winner {
    background-color: #FFD700;
}

footer {
    background-color: #1A1A1A;
    color: #FFFFFF;
    text-align: center;
    padding: 10px 0;
}

@media (max-width: 768px) {
    .burger-menu {
        display: flex;
    }

    .mobile-nav {
        display: block;
    }

    .game-board {
        grid-template-columns: repeat(10, 40px);
        grid-template-rows: repeat(10, 40px);
    }
}