title: I want a thin transparent div line separator. How to do this in CSS/html?
body: <p>Basically I want a line like the ones that separate posts on stackoverflow, only I want it vertical and to be a kind of "left border" that will be in a separate div to display links and content. So instead of making a big rectangle on the left side with links and text, I just want like a really thin, subtle gray line that goes all the way down the page.</p>
  
  <p>How would I go about doing this?</p>