That's the code from the example I linked, you can find it here along with details https://gridbyexample.com/patterns/header-asmany-span-footer/ https://gridbye

That's the code from the example I linked, you can find it here along with details https://gridbyexample.com/patterns/header-asmany-span-footer/ https://gridbyexample.com/patterns/header-asmany-span-footer... That site is where I keep all by grid demos including a whole series of tutorial videos explaining the spec.