diff --git a/_quarto.yml b/_quarto.yml
index 097ee157..97d5eb8d 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -21,7 +21,8 @@ book:
     search: true
     pinned: true
     collapse: true
-    
+    back-to-top-navigation: true
+
   sidebar:
     search: true
 
@@ -45,6 +46,7 @@ book:
       This book was built with <a href="https://quarto.org/">Quarto</a>.
 
   chapters:
+    - text: "---"
     - part: front.qmd
       chapters:
       - index.qmd
@@ -53,6 +55,7 @@ book:
       - contributors.qmd
       - copyright.qmd
       - about.qmd
+    - text: "---"
     - part: MAIN
     - introduction.qmd
     - embedded_sys.qmd
@@ -74,7 +77,7 @@ book:
     - ai_for_good.qmd
     - sustainable_ai.qmd
     - robust_ai.qmd
-  
+    - text: "---"  
     - part: EXERCISES
       chapters: 
         - niclav_sys.qmd
@@ -84,9 +87,9 @@ book:
         - kws_nicla.qmd
         - dsp_spectral_features_block.qmd
         - motion_classify_ad.qmd
+    - text: "---"
 
   references: references.qmd
-
   appendices:
       - tools.qmd
       - zoo_datasets.qmd
diff --git a/index.qmd b/index.qmd
index 446eac0c..f282ed38 100644
--- a/index.qmd
+++ b/index.qmd
@@ -31,7 +31,7 @@ If you're interested in contributing, you can find the guidelines [here](https:/
 
 # Get in Touch
 
-Got questions or feedback? Feel free to [e-mail us](mailto:vj@eecs.harvard.edu?subject="CS249r%20TinyML%20Open%20Book").
+Got questions or feedback? Feel free to [e-mail us](mailto:vj@eecs.harvard.edu?subject="CS249r%20MLSys%20with%20TinyML%20Book%20-%20").
 
 # Contributors