image grid css responsive unorganized : any suggestions on how i can make a unorganized gallery grid Like This one .

i have tagged the photo bellow.

i am limited to 6 pictures and no more ,

mostly want to make it responsive for any display size device

and my pictures are in standard horizontal format.

[The example image unorganized grid][1]


  [1]: https://i.stack.imgur.com/P0hf3.png

i have tried fixed positioning but my pictures are rectangular shapes
and i dont know how to make them mask in a polygon shape

