How to make a text inside a cell appear at top-left?

Question

The code below is a box in the periodic table. I want the num 1 to appear at top-left as in real periodic table. How? Please help!
https://code.sololearn.com/W82MjeFe3727/?ref=app

Answer 1

https://code.sololearn.com/WP7BiH1xfso8/?ref=app

Answer 2

Thanks!😊