diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index cbd927d..7668403 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -30,7 +30,7 @@ jobs:
             - uses: actions/checkout@v4
             - uses: actions/setup-node@v3
             - run: npm install -g reveal-md
-            - run: reveal-md --static
+            - run: reveal-md docs/ --static
             - uses: actions/configure-pages@v3
             - uses: actions/upload-pages-artifact@v2
               with:
diff --git a/demos/demos.md b/demos/demos.md
deleted file mode 100644
index 806a6a0..0000000
--- a/demos/demos.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# Demo's
-
-## Small games
-
-https://hub.docker.com/r/modem7/wordle
-https://hub.docker.com/r/jsonsong/docker-2048
-
-## Minecraft
-
-docker run -e "EULA=TRUE" -p "25565:25565" itzg/minecraft-server
diff --git a/docs/slides.md b/docs/slides.md
index 240980d..4bfb7c4 100644
--- a/docs/slides.md
+++ b/docs/slides.md
@@ -208,7 +208,7 @@ Tutorial: https://docs.docker.com/build/building/packaging/
 
 ### DockerHub
 
-- up- or download images on https://hub.docker.com/
+-   up- or download images on https://hub.docker.com/
 
 ![](./img/dockerhub.png)
 
@@ -348,6 +348,23 @@ sudo docker run -p 8123:80 nginx
 
 ---
 
+### Environment variables
+
+-   Sometimes, containers need some additional information
+    -   E.g. root password for container, timezone, ...
+
+---
+
+### Extra lab:
+
+-   Try out these little games, can you connect and play?
+    -   https://hub.docker.com/r/modem7/wordle
+    -   https://hub.docker.com/r/jsonsong/docker-2048
+-   Host your own Minecraft server, can you connect and play? Does the world keep existing if you delete the container and start a new one?
+    -   https://docker-minecraft-server.readthedocs.io/en/latest/
+
+---
+
 ## Docker Compose
 
 ---
@@ -584,11 +601,11 @@ services:
 
 ## You can do a lot more!
 
-- https://docs.docker.com/get-started/overview/
-- https://docs.docker.com/compose/
-- https://www.linuxserver.io/
-- https://github.com/awesome-selfhosted/awesome-selfhosted
-- https://kubernetes.io/
+-   https://docs.docker.com/get-started/overview/
+-   https://docs.docker.com/compose/
+-   https://www.linuxserver.io/
+-   https://github.com/awesome-selfhosted/awesome-selfhosted
+-   https://kubernetes.io/
 
 ---
 
diff --git a/reveal-md.json b/reveal-md.json
index 2a20097..8c2a21f 100644
--- a/reveal-md.json
+++ b/reveal-md.json
@@ -5,7 +5,7 @@
     "scripts": ["https://cdn.jsdelivr.net/npm/reveal.js-mermaid-plugin/plugin/mermaid/mermaid.min.js", "plugins.js"],
     "separator": "^\\s*---\\s*$",
     "staticDir": "html",
-    "theme": "theme.css",
+    "theme": "https://hogenttin.github.io/hogent-revealmd/_assets/theme.css",
     "title": "HOGENT - Slides",
     "verticalSeparator": "^\\s*-v-\\s*$"
 }
diff --git a/theme.css b/theme.css
deleted file mode 100644
index 7f2539a..0000000
--- a/theme.css
+++ /dev/null
@@ -1,14 +0,0 @@
-@import url(https://hogenttin.github.io/hogent-revealmd/_assets/theme.css);
-
-img {
-    max-height: 75vh;
-}
-
-section > ul,
-section > ol {
-    margin-bottom: 0.5em;
-}
-
-pre code {
-    max-height: 75vh;
-}