Install rehype-prism-plus for code highlight

Ref:
https://github.com/timlrx/rehype-prism-plus

Get your theme here:
https://github.com/PrismJS/prism-themes

I use dracula theme:
https://github.com/PrismJS/prism-themes/blob/master/themes/prism-darcula.css

contentlayer.config.ts

@@ -1,3 +1,5 @@
+import rehypePrism from 'rehype-prism-plus';
+
 import { defineDocumentType, makeSource } from './src/lib/contentLayerAdapter';
 
 export const Post = defineDocumentType(() => ({
@@ -33,4 +35,5 @@ export const Post = defineDocumentType(() => ({
 export default makeSource({
   contentDirPath: 'content',
   documentTypes: [Post],
+  mdx: { rehypePlugins: [[rehypePrism, { ignoreMissing: true }]] },
 });

package.json

@@ -17,7 +17,8 @@
     "next-contentlayer": "^0.2.7",
     "next-themes": "^0.2.0",
     "react": "18.2.0",
-    "react-dom": "18.2.0"
+    "react-dom": "18.2.0",
+    "rehype-prism-plus": "^1.5.0"
   },
   "devDependencies": {
     "@babel/core": "^7.18.13",

src/components/PostBody/PostBody.module.scss

@@ -1,12 +1,4 @@
 .postBody {
-  :global(.rehype-code-title) {
-    @apply -mb-3 rounded-tl rounded-tr bg-slate-600 px-4 pt-1 pb-2 font-mono text-sm text-gray-200;
-  }
-
-  div:global(.rehype-code-title) + pre {
-    @apply rounded-tl-none rounded-tr-none;
-  }
-
   img {
     @apply ml-auto mr-auto;
   }

src/pages/_app.tsx

@@ -1,4 +1,6 @@
 import '@/styles/globals.css';
+import '@/styles/prism-dracula.css';
+import '@/styles/prism-plus.css';
 
 import type { AppProps } from 'next/app';
 import Head from 'next/head';

src/styles/prism-dracula.css

@@ -0,0 +1,122 @@
+/**
+ * Dracula Theme originally by Zeno Rocha [@zenorocha]
+ * https://draculatheme.com/
+ *
+ * Ported for PrismJS by Albert Vallverdu [@byverdu]
+ */
+
+code[class*='language-'],
+pre[class*='language-'] {
+  color: #f8f8f2;
+  background: none;
+  text-shadow: 0 1px rgba(0, 0, 0, 0.3);
+  font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
+  text-align: left;
+  white-space: pre;
+  word-spacing: normal;
+  word-break: normal;
+  word-wrap: normal;
+  line-height: 1.5;
+  -moz-tab-size: 4;
+  -o-tab-size: 4;
+  tab-size: 4;
+  -webkit-hyphens: none;
+  -moz-hyphens: none;
+  -ms-hyphens: none;
+  hyphens: none;
+}
+
+/* Code blocks */
+pre[class*='language-'] {
+  padding: 1em;
+  margin: 0.5em 0;
+  overflow: auto;
+  border-radius: 0.3em;
+}
+
+:not(pre) > code[class*='language-'],
+pre[class*='language-'] {
+  background: #282a36;
+}
+
+/* Inline code */
+:not(pre) > code[class*='language-'] {
+  padding: 0.1em;
+  border-radius: 0.3em;
+  white-space: normal;
+}
+
+.token.comment,
+.token.prolog,
+.token.doctype,
+.token.cdata {
+  color: #6272a4;
+}
+
+.token.punctuation {
+  color: #f8f8f2;
+}
+
+.namespace {
+  opacity: 0.7;
+}
+
+.token.property,
+.token.tag,
+.token.constant,
+.token.symbol,
+.token.deleted {
+  color: #ff79c6;
+}
+
+.token.boolean,
+.token.number {
+  color: #bd93f9;
+}
+
+.token.selector,
+.token.attr-name,
+.token.string,
+.token.char,
+.token.builtin,
+.token.inserted {
+  color: #50fa7b;
+}
+
+.token.operator,
+.token.entity,
+.token.url,
+.language-css .token.string,
+.style .token.string,
+.token.variable {
+  color: #f8f8f2;
+}
+
+.token.atrule,
+.token.attr-value,
+.token.function,
+.token.class-name {
+  color: #f1fa8c;
+}
+
+.token.keyword {
+  color: #8be9fd;
+}
+
+.token.regex,
+.token.important {
+  color: #ffb86c;
+}
+
+.token.important,
+.token.bold {
+  font-weight: bold;
+}
+
+.token.italic {
+  font-style: italic;
+}
+
+.token.entity {
+  cursor: help;
+}

src/styles/prism-plus.css

@@ -0,0 +1,51 @@
+/* https://github.com/timlrx/rehype-prism-plus#styling */
+
+pre {
+  overflow-x: auto;
+}
+
+/**
+ * Inspired by gatsby remark prism - https://www.gatsbyjs.com/plugins/gatsby-remark-prismjs/
+ * 1. Make the element just wide enough to fit its content.
+ * 2. Always fill the visible space in .code-highlight.
+ */
+.code-highlight {
+  float: left; /* 1 */
+  min-width: 100%; /* 2 */
+}
+
+.code-line {
+  display: block;
+  padding-left: 16px;
+  padding-right: 16px;
+  margin-left: -16px;
+  margin-right: -16px;
+  border-left-width: 4px;
+  border-left-color: rgba(31, 41, 55, 0); /* Set code block color */
+}
+
+.code-line.inserted {
+  background-color: rgba(16, 185, 129, 0.2); /* Set inserted line (+) color */
+}
+
+.code-line.deleted {
+  background-color: rgba(239, 68, 68, 0.2); /* Set deleted line (-) color */
+}
+
+.highlight-line {
+  margin-left: -16px;
+  margin-right: -16px;
+  background-color: rgba(55, 65, 81, 0.5); /* Set highlight bg color */
+  border-left-width: 4px;
+  border-left-color: rgb(59, 130, 246); /* Set highlight accent border color */
+}
+
+.line-number::before {
+  display: inline-block;
+  width: 1rem;
+  text-align: right;
+  margin-right: 16px;
+  margin-left: -8px;
+  color: rgb(156, 163, 175); /* Line number color */
+  content: attr(line);
+}