Thanks Harald, really glad you like it.
What Don has created is a really brilliant use of the capabilities of s9y and Bootstrap to provide anybody, even with no or very little html and css knowledge, a modern, clean and fully responsive blog site.
From that point on, it then depends on your own depth of html and css (and perhaps a bit of php) knowledge as to how far you can take it
For me, I have very limited knowledge of those things, but have taught myself enough to be dangerous at best.
I certainly would not even begin to scratch the surface of Don and onli's knowledge, but the point is that it really does not take a lot.
Don and onli really helped me significantly as my site is a membership based site and there is code in those drop down menu's that changes the selections depending on whether you are logged in and at what membership level. That was a whole challenge in itself to bring into s9y and Clean Blog.
So I guess what I am saying is that the basic Clean Blog theme is great for anybody who does not want to get any deeper into web site coding but still have the ability to customise their blog through the settings that Don has provided.
After that, if you wanted to "surround" the basic blog with your own ideas and features you have the option to "embed" Clean Blog into your own design.
If you wanted to go that way, and because Clean Blog is founded on Bootstrap, I think that would be the first place to start.
Things like drop down menu's (soooo 2013
) are available through the Bootstrap platform and there are many free templates available for it that may also suit your needs or give you ideas. For me, I just learn through pushing the limits as hard as I can and trial and error. (LOTS of error).
You can create your own custom css from the standard Bootstrap css, just by using the same css classes but adding your own styles to those classes. You can also add your own custom classes as well. (Never try to just edit the main Bootstrap css as your edits will get over-ridden by any updates and always fork your Clean Blog installation if you make any changes there.)
You then load your custom style sheet after the Bootstrap css and your classes will over-ride the Bootstrap ones.
To still keep it simple, and if you have a good text editor, you could do a similar thing now, as you suggest with your current installation, by just creating your own custom.css and uploading it and then editing the page/template to have it load after any other css.
Not knowing your own circumstances, I am possibly explaining the obvious to you here, but I - and I am sure Don and others, are happy to help you achieve exactly what you want.
Hope this helps and all the best,
- Neil