How to make vertical stripe between blocks in bootstrap 4 grid?

Question

css

I want to make a decorative vertical line between the content and the sidebar. Please tell me how to implement this

<div class="container">         
         <div class="row">
            <div class="col"> контент </div>
         <div class="col-lg-3 ml-lg-3"> правый sidebar  </div>
         </div>      
      </div>

Answer 1

https://codepen.io/znalexandr/pen/aYzxKP

Answer 2

it is possible to prescribe the right border for the content block or the left border for the sidebar.