diff --git a/README.md b/README.md
index 2d1560f..67ce418 100644
--- a/README.md
+++ b/README.md
@@ -11,9 +11,8 @@
 |  6.9. | Kolloquium |
 
 <details>
-<summary>
-## Content
-</summary>
+<summary><h2>Content</h2></summary>
+
 - I2C
     - v2
         - [x] Umbau
@@ -82,9 +81,11 @@
         - [ ] stabilize
     - [ ] regulate the system (with missing information)
         - [ ] write / formulate approach and resulting formula / algorithm
+
 </details>
 
-## ToC
+<details>
+<summary><h2>Table of Contents</h2></summary>
 
 - Introduction
     - What is this about?
@@ -125,3 +126,5 @@
         - "How to calibrate a PowerIt"
     - Regulation
 - Outlook
+
+</details>