body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
}

#preview {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.envelope {
    width: 100%;
    box-sizing: border-box;
    page-break-inside: avoid;
    padding: 20px;
    border-bottom: 1px solid black;
}

.envelope strong {
    font-size: 18px;
    display: block;
    text-align: center;
    text-transform: uppercase;
    margin-bottom: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table, th, td {
    border: 1px solid black;
}

th, td {
    padding: 6px;
    text-align: left;
    font-size: 10px;
}

th {
    background-color: #f2f2f2;
}

@media print {
    .controls, .no-print {
        display: none !important;
    }

    #preview {
        display: block;
    }

    .envelope {
    }
}