Macro vertigo::css_fn_push

macro_rules! css_fn_push {
    ($name: ident, $base: ident, $block: tt) => { ... };
}

Allows to define a Css styles factory function for virtual DOM based on existing function but with added new rules.

use vertigo::{css_fn, css_fn_push};

css_fn! { green, "
    color: green;
" }

css_fn_push! { green_and_italic, green, "
    font-style: italic;
" }