string cssPath = "test.css";
CssProvider provider = new CssProvider();
provider.loadFromPath(cssPath);
unfortunately i don't know anything about yr specific problem.
but i just wanted to mention (in case you are not aware of it) that the
CSS can be embedded into the D source. this is what i did to fix GTKs
terrible design mistake for the background of Notebook:
```
enum myCSS = q{
GtkNotebook {
background-color: #e9e9e9;
}
GtkNotebook tab {
background-color: #d6d6d6;
}
};
...
int main(string[] args){
...
import gtk.CssProvider;
auto styleProvider = new CssProvider;
styleProvider.loadFromData(myCSS);
import gdk.Screen;
import gtk.StyleContext;
StyleContext.addProviderForScreen( Screen.getDefault(),
styleProvider, 800);
```
