Hello Sebastien and welcome to Advanced Installer forums,
Thank you for your interest in Advanced Installer.
1. Changing the black background color.
In order to achieve this you can change the "Background" image from "
Themes -> Preview -> More Options" section.
2. Changing the button template (specially removing the blue color arround it on mouseover).
For this you can change the button images from "Themes ->
Images" tab. Please keep in mind that it is recommended to use images with the same size as our default images. Please take a look on our
"Image Button" article.
3. Changing the height of the top bar. (circled in red).
You can change the images, from "Themes -> Images" tab, associated with
"AI_CF_FrameCaption" and "AI_CF_FrameCaptionInactive" properties.
Also, you can take a look on our
"Surface Theme Color" thread.
All the best,
Daniel