diff --git a/src/markdown.js b/src/markdown.js
index 51d2b69..4d9b5ac 100644
--- a/src/markdown.js
+++ b/src/markdown.js
@@ -67,6 +67,12 @@
       })
       return
     }
+    if (noSpaces.startsWith("---")) {
+      languages.forEach(language => {
+        result[language] += "</p></section><section><p>"
+      })
+      return
+    }
     if (noSpaces.startsWith("%")) {
       language = noSpaces.substring(1)
       return

diff --git a/src/markdown.js b/src/markdown.js
index 51d2b69..4d9b5ac 100644
--- a/src/markdown.js
+++ b/src/markdown.js
@@ -67,6 +67,12 @@
       })
       return
     }
+    if (noSpaces.startsWith("---")) {
+      languages.forEach(language => {
+        result[language] += "</p></section><section><p>"
+      })
+      return
+    }
     if (noSpaces.startsWith("%")) {
       language = noSpaces.substring(1)
       return
diff --git a/src/presentation/main.md b/src/presentation/main.md
index 16bdcb4..6ab49de 100644
--- a/src/presentation/main.md
+++ b/src/presentation/main.md
@@ -1,4 +1,8 @@
-%German
-## Die Schr"odinger Gleichung
 %English
 ## The Schrodinger Equation
+%German
+## Die Schr"odinger Gleichung
+
+---
+
+### Die harmonische Schwingung

diff --git a/src/markdown.js b/src/markdown.js
index 51d2b69..4d9b5ac 100644
--- a/src/markdown.js
+++ b/src/markdown.js
@@ -67,6 +67,12 @@
       })
       return
     }
+    if (noSpaces.startsWith("---")) {
+      languages.forEach(language => {
+        result[language] += "</p></section><section><p>"
+      })
+      return
+    }
     if (noSpaces.startsWith("%")) {
       language = noSpaces.substring(1)
       return
diff --git a/src/presentation/main.md b/src/presentation/main.md
index 16bdcb4..6ab49de 100644
--- a/src/presentation/main.md
+++ b/src/presentation/main.md
@@ -1,4 +1,8 @@
-%German
-## Die Schr"odinger Gleichung
 %English
 ## The Schrodinger Equation
+%German
+## Die Schr"odinger Gleichung
+
+---
+
+### Die harmonische Schwingung
diff --git a/src/static/video/.gitkeep b/src/static/video/.gitkeep
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/static/video/.gitkeep