Template not functioning correctly

Here you can see my screenshots that you can see I have done according to your instruction. And than see on page www.tip-reisen.de/ that there is still the border.

remove :

.item IMG, .item-page IMG {
border: 3px solid #474747 !important;
}

from bottom of template_css.css

then control border for each image in editor.

than the border is allways black. I would like to have a gray border. This I have said already in the beginning. So, we are turning in a circle.

because your editor uses border="X" attribute for <IMG... tag which is deprecated. Find better editor component for joomla or you can edit HTML to add definition of border in style attribute like this:

<IMG style="border:1px solid gray;" ...

currently your editor does this:

<IMG border="X" <- this is bad