Adding vertical lines

you could probably define left/right borders in the css. Its hard to guess how that would work for your theme unless you provide a link though.

https://www.balladsandbows.com

As the content and sidebar divs are not full height, the best way to achieve this would probably be to add to the #wrapper element a 1px tall repeating background image to define the line.

Try adding this to the Custom CSS box und <b>Appearance > Brunelleschi Options</b>:

#main {
    border-right: 1px solid #CCC;
    border-left: 1px solid #CCC;
}