My markdownIt style not working in vuejs3

An application with view inertiajs. I installed vue3-markdown-it https://github.com/JanGuillermo/vue3-markdown-it but the style does not apply whether it is on h1, h2, h3,... blockqote lists etc. None of the styles work, I don't know if I configured them incorrectly or if it's me who has to personalize the styles. Here is my blog screen

The way i used it :

import Markdown from "vue3-markdown-it";

<Markdown :source="post.data.body" />