.content_table {
    background-color: #eee;
    border: 3px black ridge;
    border-spacing: 0;
    border-collapse: collapse;
    padding: 2px;
    font-size: 1.1em;
}
.content_table th {
    background-color: darkblue;
    color: white;
    border: 1px gray solid;
    padding: 2px 5px;
}
.content_table td {
    border: 1px gray solid;
    padding: 2px 5px;
}

.picture_gallery {
    width: 100%;
    text-align: center;
}