Extended markdown is not working

[waynee95]

Vuepress adds some extensions to markdown.

You can use

::: warning
This is a warning
::::

To display a yellow box on the page. But this does not in our theme.

But it works in the documentation of the theme's website as seen here https://vuepress-theme.mrhope.site/en/guide/feature/blog/#timeline

If I try to use it on our site, it will render Chinese characters and no box at all.