Hi I am working on a new Wordpress blog and it for code tutorials so it's very important to have code snippets in it , I tried many plugins but I comfortable with Code Snippet Library
The issue is it's not working on my custom theme I tried twenty fifteen, twenty fourteen and twenty thirteen and it work great on all of them,
How I know the part in my theme that conflict with the plugin, or what I have to add to my theme to support this plugin.
EDIT - what I have done:
1- I downloaded the plugin from here .
2- then uploaded it in my plugins folder and unzipped it.
3- go to admin panel and activate the plugin.
4- go to code snippet menu and added a new snippet.
5- get the shortcode of the snippet and use it in my post.
the result is the code get displayed but without any theming or code highlighting from the plugin.
the expected result is 
and that what I get when go and edit the snippet EDIT- here is the link of my blog page
