That's nice, but I value text that renders at a legible size more than I value leaving the majority of my screen empty. This layout isn't effectively using negative space, it's just wasting the entire screen. At least on mobile.

On mobile I just use two thumbs to zoom in to the column I want to read.

Blatant ableism against the mono-thumbed or thumbless.

The mono-thumbed can always double-tap the desired column, and thumbless folx can use their nose.

If only we had simple CSS rules to present things in a way that doesn't require one to do this

ᵀʰᵃᵗ’ˢ ʷʰʸ ᴵ ᵐᵃᵏᵉ ᶜᵒᵐᵐᵉⁿᵗˢ ˢᵐᵃˡˡᵉʳ ᵒⁿ ᵖᵘʳᵖᵒˢᵉ

How did you do that?

Unicode tricks. A quick Google search for "small text generator" will point you in the right direction.

Ḩ̸̻̹̝̯̮̖͚͔̙̙̰̞̳̩͎̻̅͛͆̌͑̈͗͐͆̀̇̈͋͜î̴̡̺̬͚̠̻̺̮̤̥̟̜͗͐͋͌̄̈͂̽̒́́̋͜͠͠s̵̻̗̰̒̈̿͌̅͗̽̈́͝ ̶̱̣̗͍̬̲̘̣͍̥̟̦̫̬́̈͗͂̾̍̉͊̌̚ͅą̸̤̤̳̺̹͆̆̍̾̌̿̅̽͌̔̿̒̎̂̉̈́͐̚͝ȑ̷͉̄̏́̔̒́̇̈́̑͆̀͌̎̌̆̕͝r̷̗̮͙̱̹̣̤͚͐͐̕į̷̨̡̡̛̛̹̱̹̹̺̬͔̬͇̎́͑̈͒̈́͌͛̐͂́̈́̚͜͝v̸̡̢̛̼̝̜̞̜͕̫̳̣̰̺̮͈̗̞̦̰̰͇͊̅̏͆̄̊͒͑̂̈́̉͛͋͛͘̕a̴̭̱̒l̵͖̗̳̪̯̣̗͋̋͋̑̎̌̌̓͆͒̑̆͐͊͝͝͝͠ ̶̹̫̪͓͈̘̳̈͜ͅw̵̬̪͖̭̲̪͝ͅạ̴̛̞͙͉̀́́̐͌̅͗͆̃̀͆̒̄̈́́̚ṡ̵̯͕́̓̈́͆̈̈͆̀͆ ̵̮̪̪̹̻̓̊̏̀̂̽̓̈́̄̏̅̊̊̎̂̚͘̚͠f̸͍͎͇̺̪̩̯̾ͅo̴̟̬͙͈̮͔̿̈́̈̑͊̀̽̎̕r̵̛͎̳̻̜̦̺̥̦̞͐͌̽́̔̈͌̂̀͛͌̓̉̔͋̆̏͊͘͝ţ̵̧̢̧̻̻̺͎͙̠͈̩̪̥͇̥̮̿̇̏̍̉̀̉͒͐̌̔̈́́̚̕͠o̶͖̤̜̟̱̖͓͍̖̲̮̮̫͎̜̫͕̖̼̕̕l̴̢̺͍̾̒̄̈͘ḏ̷̛̗͖̝͚͕͕̬̖̱̬̗̳̘̪̠̹͛̋̀̄̇̌͆̒̄̇̀̑͝ͅͅͅ.̴̨̨̢̦̜͕̞̬͍̹̟̩͖̥̗̹͉̼̹̊̎̓̒̏̋͜ ̸̡̼̝̥͔̯̠̤̰̘̙̗͓̫̦͙̎̈́̓͊̑̒̅H̷̡̻̖͍̜̞̥͓̩͈͓̿̓̋͠ͅë̸̹̠̗̼̂̀̋̃̑̓̓̇̚ ̷̧̡̛͈̮̞̙̳͂̍̔̽̑́̋̀̐̈́̾͌̅̎̂̔̿̚͝ͅc̵̥̗̲̬͓͈͕̘̱͖̜̭̖̱̳̏̎̎̀͊̎̾͊̊̑͘͜ȏ̵̲̖̼̘͔͚̰͍̜͔͚͘͝ͅͅm̶̢̝̬̹͉̞̩̗͛̓̅̎͊̌̕͘̚͠ȩ̷̯̦̫̤̲̞͒͒̒́̌̓̒̍̎͠s̴̡̧̢̱͔͈͈̩̖̥̖̻̻̣̗̭̣̞̥̝̤̮̖͛̽̈̌̎̇.̴̝̗͖̗͙̦̱̀͛̃͑̓̀̀͑͊̂̂̿̽̀̐͂́͘͘ ̶̡̢̟̼̻̣̠͓͕̦̲̗̩̹̔͆̒͝ͅ

You're free to call that "negative space", it's still 70% of my screen that's just blinding white, and 30% that's a tiny, non-responsive column layout. You call it perfect, I call it annoyingly empty and bad usability on mobile.