*{
    box-sizing:border-box;
}

body{

    margin:0;

    font-family:Arial,Helvetica,sans-serif;

    background:#eef2f5;

}

header{

    background:#003366;

    color:white;

    padding:30px;

    text-align:center;

}

.grid{

    display:grid;

    grid-template-columns:repeat(auto-fit,minmax(280px,1fr));

    gap:25px;

    max-width:1400px;

    margin:auto;

    padding:30px;

}

.card{

    background:white;

    border-radius:10px;

    padding:20px;

    box-shadow:0 3px 12px rgba(0,0,0,.15);

}

footer{

    background:#003366;

    color:white;

    text-align:center;

    padding:20px;

}