How to sort images like in VKontakte?

Question

css

Hello.
Tell me, please, how to make the images line up like in VKontakte posts (see the image under the spoiler)
I tried to Google, but something does not help. I don’t know how to formulate a request ... It gives out all kinds of garbage.

Image

Answer 1

masonry

Answer 2

https://codepen.io/Nolis/pen/jOPyNdm
was thrown in a hurry, it needs to be corrected a little, since the images as below will not resize.
well, all you need is a concept :)
no one will do all the work for you :p

Answer 3

.block {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
}