tweaking post-image width fails

hi folks,

already searched and tried for a while just to get this to work... sadly no effort.
i am trying to tweak the width of the post-image for blog posts overview and tried with following css:

@media (min-width: 769px) and (max-width: 1100) {
    .post-image-aligned-left .inside-article .post-image {
        max-width: 50%;
    }
}

the funny thing is: it absolute works without the @media part! but thats not useable, as the goal lies in between mobile an desktop, rest is o.k.

so what i am doing wrong??? why does it work without @media but not with it?
... ???

completely exceeds my understanding, so any help highly appreciated.

edit:
OH MY GOD!!
really never should work under pressure!!! found it:)
not only forgot some little 'px'... forgot another testing-snipplet as well!
so apparently it work.

SORRY - if someone asks: never was here! ;)