Cannot see vertical line on desktop view

Site URL: https://blueberry-giraffe-nb5j.squarespace.com/

Hello squarespace community!!

I'm having a lot of trouble actually SEEING the vertical line that I put on my about page in between the text columns. First, I put in a code clock in like so 

<div class="vertical-line"></div>

And then I put this in the custom CSS

.vertical-line {
  background: #000;
  width: 1px;
  height: 200px;
  margin: 0 auto;
}

I've made it so that it only appears on desktop and it doesn't appear anywhere. I'm about to pull out my hair. Thank you in advance for your help. 

The following rule-set is not in any kind @media statement that I can see. So your div is always "hidden".

.vertical-line {
    display:none !important;
}

I thought I was hiding it on tablet and mobile with that line. Ok. Thank you so much, Creedon!