<p>Ok, finally solve with the help of Gtk Inspector. With these rules you can customize a dark theme for sidebar and dialogs (I didn't want to customize entire interface):</p>
<p>#GeanyDialog GtkButton,<br>
#GeanyDialog GtkButton GtkLabel,<br>
#GeanyDialog GtkButton GtkImage,<br>
#GeanyDialog GtkWidget GtkEntry,<br>
#GeanyDialog GtkWidget GtkButton<br>
{<br>
background: #f0f0f0;<br>
color: #000;<br>
}</p>
<p>#GeanyDialogSearch,<br>
#GeanyDialog,<br>
GtkTreeView<br>
{<br>
background: #1e1e1e;<br>
color: #fff;<br>
}</p>
<p>#GeanyDialog GtkWidget<br>
{<br>
background: transparent;<br>
}</p>
<p>GtkTreeView:hover,<br>
GtkTreeView:insensitive,<br>
GtkTreeView:active {<br>
background: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="108168511" data-permission-text="Issue title is private" data-url="https://github.com/geany/geany/issues/666" href="https://github.com/geany/geany/pull/666">#666</a>;<br>
}</p>
<p>GtkTreeView:selected {<br>
background-color: #2F5692;<br>
color: #fff;<br>
}</p>

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