How to add vertical line on a complete wordPress page?

admin

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I'm using Flatsome theme on wordpress and need to draw vertical lines on three sides (left center right) on a complete home page. you can see as a reference site (<a href="https://pelicula.qodeinteractive.com/" rel="nofollow noreferrer">https://pelicula.qodeinteractive.com/</a>) where vertical line are implemented on-page. These vertical lines are implemented from top to end and I need the same in my design.
Is there any plugin that can help?
What approach should I consider?
Any suggestion would be appreciated
(<a href="https://pelicula.qodeinteractive.com/" rel="nofollow noreferrer">https://pelicula.qodeinteractive.com/</a>)