Reading this post I found out how do col span in mark down. Nevertheless if I use this:
| One | Two | Three | Four |
| ------- | ---------- | ------- | ------------- |
| One | Two | Three | Four |
| One | Two | Three | Four |
| ------- |----------- | ------- | ------------- |
| Span Across ||||
I get this from https://markdown-here.com/livedemo.html :
How to use col span in markdown?