text: import { useApi } from '@polkadot/react-hooks';
  
  const themeDict = {
    "Crust": "mainnet",
    "Crust Maxwell": "maxwell",
    "Crust Rockey": "rockey"
  }
  export function useThemeClass(){
    const {systemChain} = useApi()
    return themeDict[systemChain] || "rockey"
  }
  