Changes on WordPress components

we have more than 100 sites which are based on wordpress, they have different themes and to make them look very common, we made common header, footer and small image in the smal triangle image in the left. We made plugin to install this components on different websites, so plugin is creating child theme and appling our header footer in new site. In this poject we have couple of small issues which should be fixed. 1. it does not work for all themes (mainly we have more than 20 themes), so you should make it very general 2. it is not fully responsive, after 800x600 it is not, so you should make it full responsive To work with this, you will need to login (ask for details), go to theme (active theme is child theme of theme Diavlo) and start making your changes on [login to view URL], after you fix it for one theme, change following lins on theme and point them to next theme (line Template: Diavlo and line @import url('../Diavlo/[login to view URL]'); point them to net theme for example to theme "Colour blue 3", than activate some other theme and activate child again, WP will recognize child as a child of Colour blue 3", now test and fix problems and start over. this part of design should have same face as a (ask for URL) for all themes we have. Also, we have options for our plugin, it allow to choose color, we will provide colors (gradient and for lines), put it there, too.