body {
    font-family: Arial, sans-serif;
}
header {
    background-color: #f4f4f9;
    padding: 10px 20px;
    text-align: center;
}
.card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    padding: 20px;
}
.card {
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
    transition: 0.3s;
    width: 45%;
    margin: 10px;
    text-align: center;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
}
.card h2 {
    margin: 16px 16px 12px;
    padding: 10px 14px;
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.01em;
    color: #1f2937;
    background-color: #f8fafc;
    border: 2px solid #cbd5e1;
    border-radius: 12px;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
}
.card:hover {
    box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2);
}
.thumbnail {
    display: block;
    width: 100%;
    height: auto;
}
@media only screen and (max-width: 600px) {
    .card {
        width: 90%;
    }
}