diff --git a/architecture/os/README.md b/architecture/os/README.md
index 620466a..e3d2cc9 100644
--- a/architecture/os/README.md
+++ b/architecture/os/README.md
@@ -43,21 +43,21 @@ On distingue trois grandes familles de systèmes d'exploitation aujourd'hui :
 
 
 
-
-
-<img src="assets/Icon_Mac.svg" alt="icone apple" style="zoom:25%;" />
+<img src="assets/Apple.png" alt="icone apple" style="zoom: 150%;" />
 
 
 
-<img src="assets/windows.svg" alt="windows" style="zoom:25%;" />
+<img src="assets/Windows.png" alt="windows" style="zoom:150%;" />
 
-<img src="assets/GNU_and_Tux.svg" alt="GNU and Tux" style="zoom:25%;" />
+<img src="assets/gnu.png" alt="GNU and Tux" style="zoom: 150%;" />
+
+<img src="assets/tux.png" alt="tux" style="zoom:150%;" />
 
 <img src="assets/IOS_logo.png" alt="ios"  />
 
 
 
-<img src="assets/android.svg" alt="Android" style="zoom:25%;" />
+<img src="assets/android.png" alt="Android" style="zoom: 150%;" />
 
 ---------------
 
@@ -95,7 +95,7 @@ Dans le cadre du cours, nous étudierons et utiliserons un système libre : [Ubu
 
 En 1991, [Linus Torvald](https://fr.wikipedia.org/wiki/Linus_Torvalds) étudiant de 21 ans, crée le noyau Linux, permettant de développer des systèmes d'exploitation libres et open sources. Le nom Linux provient du prénom de son créateur et de la référence aux systèmes [Unix](https://fr.wikipedia.org/wiki/Unix), famille d'OS crée dans les années 70.
 
-<img src="assets/Tux.png" alt="Tux" style="zoom: 25%;" />
+<img src="assets/tux.png" alt="Tux"  />
 
 > Tux, la mascotte du noyau Linux, crée par Larry Ewing, développeur du logiciel GIMP.
 
@@ -105,7 +105,7 @@ Parallèlement, [Richard Stallman](https://fr.wikipedia.org/wiki/Richard_Stallma
 
 
 
-<img src="assets/gnu.png" alt="GNU" style="zoom:25%;" />
+<img src="assets/gnu.png" alt="GNU"  />
 
 > Logo du système GNU
 
@@ -173,7 +173,7 @@ Je vous invite vivement à aller explorer, tester, essayer ces systèmes.
 
 - [Free Software Foundation](https://www.fsf.org)
 
-- Images (Wikipédia domaine public et CC BY SA 
+- Images (Wikipédia domaine public et CC BY SA)
 
   - Rôle d'un système d'exploitation https://commons.wikimedia.org/wiki/File:Role_of_an_Operating_System.svg
   - Icone Apple https://commons.wikimedia.org/wiki/File:Icon-Mac.svg
diff --git a/architecture/os/assets/Apple.png b/architecture/os/assets/Apple.png
new file mode 100644
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deleted file mode 100644
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