diff --git a/Dockerfile b/Dockerfile
index afade46..1b696ab 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
-FROM node:lts
+FROM node:16-bookworm
+RUN apt-get update && apt-get install -y libvips-dev libc6
 WORKDIR /app
 COPY package*.json ./
 RUN npm install
diff --git a/_src/assets/base.css b/_src/assets/base.css
index 1ffeadf..82d954e 100644
--- a/_src/assets/base.css
+++ b/_src/assets/base.css
@@ -79,9 +79,16 @@ main {
   font-family: 'RobotoMono', monospace;
 }
 main, h1, h2, h3, h4, h5, h6, pre, ul, ol, p, table, input, button {
-  background-color: rgba(2,2,2,.75);
+  background-color: rgba(2,2,2,.35);
   box-shadow: 0 0 calc(.5vh + .5vw) calc(.5vh + .5vw) rgba(2,2,2,.75);
 }
+.header-anchor {
+  text-decoration: none;
+  color: rgba(255,255,255,.75);
+}
+.header-anchor:hover {
+  color: rgba(255,255,255,1)
+}
 input, button {
   font-family: inherit;
   font-size: inherit;
diff --git a/eleventy.config.js b/eleventy.config.js
index 107f026..5ce258c 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -88,16 +88,16 @@ module.exports = function(eleventyConfig) {
   })
 
   // Customize Markdown library and settings:
-  let markdownLibrary = markdownIt({
-    html: true,
-    breaks: true,
-    linkify: true
-  })//.use(markdownItAnchor, {
-  //   permalink: true,
-  //   permalinkClass: "direct-link",
-  //   permalinkSymbol: "#"
-  // })
-  eleventyConfig.setLibrary("md", markdownLibrary)
+	eleventyConfig.setLibrary("md", markdownIt({
+		html: true,
+		breaks: true,
+		linkify: true,
+	}).use(markdownItAnchor, {
+		permalink: markdownItAnchor.permalink.headerLink(),
+		level: [2, 3, 4, 5, 6],
+		slugify: eleventyConfig.getFilter('slugify'),
+		tabIndex: false,
+	}))
 
   // Override Browsersync defaults (used only with --serve)
   eleventyConfig.setBrowserSyncConfig({
diff --git a/package-lock.json b/package-lock.json
index c632462..f19970c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
         "@11ty/eleventy-plugin-syntaxhighlight": "^4.2.0",
         "luxon": "^1.28.1",
         "markdown-it": "^12.0.4",
-        "markdown-it-anchor": "^7.1.0"
+        "markdown-it-anchor": "^8.6.7"
       }
     },
     "node_modules/@11ty/dependency-tree": {
@@ -399,6 +399,31 @@
         "node": ">=8"
       }
     },
+    "node_modules/@types/linkify-it": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@types/linkify-it/-/linkify-it-3.0.4.tgz",
+      "integrity": "sha512-hPpIeeHb/2UuCw06kSNAOVWgehBLXEo0/fUs0mw3W2qhqX89PI2yvok83MnuctYGCPrabGIoi0fFso4DQ+sNUQ==",
+      "dev": true,
+      "peer": true
+    },
+    "node_modules/@types/markdown-it": {
+      "version": "13.0.4",
+      "resolved": "https://registry.npmjs.org/@types/markdown-it/-/markdown-it-13.0.4.tgz",
+      "integrity": "sha512-FAIUdEXrCDnQmAAmJC+UeW/3p0eCI4QZ/+W0lX/h83VD3v78IgTFYftjnAeXS8H0g4PFQCgipc51cQDA8tjgLw==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "@types/linkify-it": "*",
+        "@types/mdurl": "*"
+      }
+    },
+    "node_modules/@types/mdurl": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@types/mdurl/-/mdurl-1.0.4.tgz",
+      "integrity": "sha512-ARVxjAEX5TARFRzpDRVC6cEk0hUIXCCwaMhz8y7S1/PxU6zZS1UMjyobz7q4w/D/R552r4++EhwmXK1N2rAy0A==",
+      "dev": true,
+      "peer": true
+    },
     "node_modules/@types/minimatch": {
       "version": "3.0.5",
       "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.5.tgz",
@@ -1860,11 +1885,12 @@
       }
     },
     "node_modules/markdown-it-anchor": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/markdown-it-anchor/-/markdown-it-anchor-7.1.0.tgz",
-      "integrity": "sha512-loQggrwsIkkP7TOrESvmYkV2ikbQNNKhHcWyqC7/C2CmfHl1tkUizJJU8C5aGgg7J6oXVQJx17gk7i47tNn/lQ==",
+      "version": "8.6.7",
+      "resolved": "https://registry.npmjs.org/markdown-it-anchor/-/markdown-it-anchor-8.6.7.tgz",
+      "integrity": "sha512-FlCHFwNnutLgVTflOYHPW2pPcl2AACqVzExlkGQNsi4CJgqOHN7YTgDd4LuhgN1BFO3TS0vLAruV1Td6dwWPJA==",
       "dev": true,
       "peerDependencies": {
+        "@types/markdown-it": "*",
         "markdown-it": "*"
       }
     },
diff --git a/package.json b/package.json
index 27819e7..25cf33e 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,6 @@
     "@11ty/eleventy-plugin-syntaxhighlight": "^4.2.0",
     "luxon": "^1.28.1",
     "markdown-it": "^12.0.4",
-    "markdown-it-anchor": "^7.1.0"
+    "markdown-it-anchor": "^8.6.7"
   }
 }