making grid lines visible on the live site
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thats a little harder to do.
if you use your browsers inspector, and check out any .column-wrap div, you will see:

if you copy the CSS you see:
grid-template-columns: 50px minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 50px;this is basically the grid. this code will look different for you. cause probably you setup the grid differently than me.
now if you ask gemini or chatgpt:
create html and css where its an overlay position fixed on top that creates vertical lines on top of the grid columns. this is the grid we have:
grid-template-columns: 50px minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 1% minmax(0, 1fr) 50px;
you may get a good answer that contains javascript, css and html to create this.
otherwise you can just add vertical lines:


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yea this is kinda hard to do :/