diff --git a/01.courses/01.optics/03.the-nature-of-light/03.annex/annex.fr.md b/01.courses/01.optics/03.the-nature-of-light/03.annex/annex.fr.md
index 18b6e75ff..98f88b2b8 100644
--- a/01.courses/01.optics/03.the-nature-of-light/03.annex/annex.fr.md
+++ b/01.courses/01.optics/03.the-nature-of-light/03.annex/annex.fr.md
@@ -5,6 +5,8 @@ slug: annexe
 
 ## Annexe
 
+!!!! DUMMY CONTENT
+
 ### Tests
 
 La [Constante $c$](#une-constante-fondamentale-de-la-nature-la-vitesse-de-la-lumière).
diff --git a/test/default.md b/test/default.md
index ef2cffcb5..2d3e63330 100644
--- a/test/default.md
+++ b/test/default.md
@@ -8,6 +8,8 @@
 4. `~~`: ~~double tilde~~
 5. `~`: tilde
 
+____
+
 #### Definition list
 
 <!-- definition lists -->
@@ -48,10 +50,12 @@ e^{i\tau}=1
 #### Iframe
 
 <!-- https://wiki.geogebra.org/en/Reference:Material_Embedding_(Iframe) -->
-<iframe class="geogebra" src="https://www.geogebra.org/material/iframe/id/wkrw5qgm/sfsb/true" fullscreen allowfullscreen width="400px" height="280px"></iframe>
+<iframe class="geogebra" src="https://www.geogebra.org/material/iframe/id/wkrw5qgm/sfsb/true" allowfullscreen width="400px" height="280px"></iframe>
 
 #### ???
 
+See https://wiki.geogebra.org/en/Reference:GeoGebra_Apps_Embedding
+
 ### Videos
 
 #### Iframe