Hi @KBConcepts
Not sure I understand your question…
In Blocs 2 you could style the hamburger color and background (it was an icon).
In Blocs 3, the hamburger has become an svg image file (like @Jakerlund just mentioned). This is why many people have difficulties modifying it. And I must say it is not the easiest. But some of the code provided works. For ease of reference on Blocs 3 changes:
https://help.blocsapp.com/knowledge-base/change-toggle-navigation-symbol-colour/
You can look at the following post I replied to Coloring the toggle - solved
So if you want to style the hamburger in Blocs 3, another way is to build your own navigation using an icon. Then there will be a little more work but that is the cost of freedom 
MDS