fix an issue in a html site

I need a quick job to fix an issue in a html page. the site is [login to view URL] you will see 2 invoices images, click on the first one, then click on the 3rd + sign from top to bottom. it will display a popup and if you move the mouse over it in some parts it highlights the text and display a test in the left part of the site. thing is that i need when you highlight the text to highlight one column from the bottom part of the popup and if you highlight the next text it higlight the next column too. please see the site in the link provided and compare with the image im attaching here.