%%{init: { 'themeCSS': '} * { background: lightblue }' } }%%
  flowchart TD
    a --> b
    

   %%{init:{"theme":"base", "themeVariables": {"primaryColor":"#411d4e", "titleColor":"white", "darkMode":true}}}%%
    flowchart LR
    subgraph A
        a --> b
    end
    subgraph B
        i -->f
    end
    A --> B