At phone size screens there isn’t bigger change how it looks compared to other ”basic” ones so basically this changes things a bit at tablet level — because there is no functional hamburger icon. It may work and look differently at bigger laptops and desktops.
But I really like how the sidebar looks with that, fonts are nice.
So could I suggest you make a component that gives same look to other themes? That would be really nice 
Or is it just matter of CSS?