How could I enable Shiki Syntax Highlighting in custom theme

[cheekyshibe]

Hey guys, I'm using vitepress and design a simple custom theme (not extending default theme).

From document: https://vitepress.dev/guide/markdown#syntax-highlighting-in-code-blocks

VitePress uses Shiki to highlight language syntax in Markdown code blocks, using coloured text. Shiki supports a wide variety of programming languages. All you need to do is append a valid language alias to the beginning backticks for the code block:

If I do not use the default theme for vitepress, code block will look like this:

// Working of implicit type-conversion

#include <iostream>
using namespace std;

int main() {

   int num_int;
   double num_double = 9.99;

   // implicit conversion
   // assigning a double value to an int variable
   num_int = num_double;

   cout << "num_int = " << num_int << endl;
   cout << "num_double = " << num_double << endl;

   return 0;
}

It seems CSS files Shiki need are missed. So it there a way to use Shiki simply in custom theme?

[cheekyshibe]

Simmilar problem with #3737

It need developers to find CSS properties for Shiki code tag, maybe a workaround. Is there a more unified or simpler approach that could be provided?