Update cheatsheet.fr.md

12.temporary_ins/10.electrostatics-vacuum/40.gauss-theorem-applications/25.cylindrical-charge-distributions/10.gauss-integral/20.overview/cheatsheet.fr.md

@@ -181,7 +181,9 @@ Téléversé dès que c'est prêt.
 
 #### Quelle surface de Gauss $`\mathbf{\mathcal{S}_G}`$ choisir ?
 
-#### Quelle surface de Gauss ![](https://latex.m3p2.com/render?input=latex&output=mathml&foreground=%23000000&foreground_alpha=136&background=%23ff2f71&background_alpha=113&source=%5Cmathbf%7B%5Cmathcal%7BS%7D_G%7D&width=800) choisir ?
+#### Quelle surface de Gauss ![](https://latex.m3p2.com/render?input=latex&output=svg&foreground=%23000000&foreground_alpha=255&background=%23ffffff&background_alpha=0&source=%5Cmathbf%7B%5Cmathcal%7BS_G%7D%7D&width=800) choisir ?
+
+#### Quelle surface de Gauss ![](https://latex.m3p2.com/render?input=latex&output=mathml&foreground=%23000000&foreground_alpha=255&background=%23ffffff&background_alpha=0&source=%5Cmathbf%7B%5Cmathcal%7BS_G%7D%7D&width=800) choisir ?
 
 * La **surface de Gauss $`\mathbf{\mathcal{S}_G}`$** doit :
    * être une *surface fermée*.