Make a horzontal and vertical line with HTML

Site URL: https://familybredpuppies.squarespace.com/config/design/custom-css

Hi!

I am wanting to add a vertical and horizontal line (see red lines in screenshot below)

I tried for the vertical line using the HTML code block <div class="vl"></div>

and the CSS

.vl {
border-left: 2px solid #000000; 
  height: 150px; 
  position: absolute;
  left: 50%; 
  margin-left: -1px; 
  top: 0;
}
 

The problem with the vertical line if I don't have a spacer between the two photos, the right photo covers the vertical line, BUT the spacer cuts off the top of the vertical line, how can I avoid using the spacer? and what can I do for the vertical line?

Thank you! 

Hi,

Which page are you referring to? I don't see it on homepage