I wanted to make a grid of images using css grid, with all images being different sized squares.
I stumbled on the article on css tricks: Aspect Ratios for Grid Items
On their example on codepen I noticed that the square 1/1 ratio grid is always 4px higher than wide.
I can't figure out how to remove these 4px.
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  place-items: start;
}
.grid > * {
  background: orange;
  width: 100%;
}
.grid > [style^='--aspect-ratio']::before {
  content: "";
  display: inline-block;
  width: 1px;
  height: 0;
  padding-bottom: calc(100% / (var(--aspect-ratio)));
  vertical-align: bottom; /* new */
}
<div class="grid">
  <div style="--aspect-ratio: 2/1;">2/1</div>
  <div style="--aspect-ratio: 3/1;">3/1</div>
  <div style="--aspect-ratio: 1/1;">1/1</div>
</div>