body {
    font-family: Arial;
    margin:0;
    background:#f4f4f4;
}

header {
    background:#111;
    color:#fff;
    padding:20px;
}

.grid {
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:20px;
    padding:40px;
}

.card {
    background:#fff;
    padding:20px;
    text-decoration:none;
    color:#000;
    border-radius:8px;
    box-shadow:0 3px 10px rgba(0,0,0,0.1);
}