body {
    font-family: Arial, sans-serif;
    background: #fff;
    margin: 0;
    padding: 0;
}

header {
    background: #000;
    color: #fff;
    padding: 10px;
    text-align: center;
}

.container {
    padding: 10px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 8px;
}

.wallpaper img {
    width: 100%;
    border-radius: 6px;
}

@media (min-width: 600px) {
    .container {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}