<img src="https://picsum.photos/id/11/200/300" >
<img src="https://picsum.photos/id/18/300/300" >
<img src="https://picsum.photos/id/20/200/200" >
<img src="https://picsum.photos/id/30/200/200" >
<img src="https://picsum.photos/id/35/200/400" >
<img src="https://picsum.photos/id/42/200/200" >
<img src="https://picsum.photos/id/118/250/200" >
<img src="https://picsum.photos/id/120/200/200" >
<img src="https://picsum.photos/id/125/300/200" >
<img src="https://picsum.photos/id/132/200/250" >
<img src="https://picsum.photos/id/178/200/200" >
<img src="https://picsum.photos/id/183/200/400" >

body {
  display: grid;
  grid-template-columns: repeat(auto-fill,minmax(150px,1fr));
  gap: 8px;
}
img {
  aspect-ratio: 1;
  width: 100%;
  height: auto;
  object-fit: cover;
}