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I am having difficulties to assemble the mosaic of the example below for the mobile version of my site
The version in orientation:portrait must be something similar to that:
..........................
.          |             .
.  Img 1   |             .
.          |             .
...........|  Img 3      .
.          |             .
.          |             .
.  Img 2   |             .
..........................
And when the site is placed on landscape
I want them to be in 3 columns like this:
  ...........................
  .      |        |         .
  .      |        |         .
  . Img1 | Img 2  | Img 3   .
  .      |        |         .      
  ...........................
About the images which size they should be?
It has to be pure CSS?
– Asura Khan
Open to all solutions, pure css preference, but if you have another good solution I accept too.
– Leo Letto
I highly recommend using Bootstrap, it will keep a clean responsive and the image dimensions will "not lose" your pixels.
– Asura Khan