Have you not tried CSS Grid yet? Do! Open codepen.io. Make a list. On the <ul>, apply `display:grid; grid-template-columns: 1fr 1fr 1fr;`
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Add / subtract <li>s. See what happens. Add more `1fr`. See what happens. Add a `2fr`, or `1.5fr`. See what happens. You’re doing it!
Use Firefox to see your lines with the Grid Inspector in Dev Tools: 1) Inspect. 2) Find where it says display:grid. 3) Click the waffle icon