body {
    margin: 0;
    height: 100vh;
    text-align: center;
}

.pages {
    display: flex;
    justify-content: center;
}

.top-row,
.bottom-row {
    display: flex;
    height: 50%;
}

.bbox {
    width: 60%;
    border: 3px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
}

.sbox {
    width: 40%;
    border: 3px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
}

a {
    text-decoration: none;
    color: inherit;
}

.popup {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);

    justify-content: center;
    align-items: center;
}

.popup-content {
    background: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    min-width: 250px;
}

.popup-content a {
    display: block;
    margin: 10px 0;
    text-decoration: none;
    color: black;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
}

.popup-content a:hover {
    background: #eee;
}

.popup-content button {
    margin-top: 15px;
    padding: 8px 16px;
}