open-props/src/props.aspects.css

<div align="center"> 

:where(html) {
  --ratio-square: 1;
  --ratio-landscape: 4/3;
  --ratio-portrait: 3/4;
  --ratio-widescreen: 16/9;
  --ratio-ultrawide: 18/5;
  --ratio-golden: 1.6180/1;
}