Update cheatsheet.fr.md

12.temporary_ins/44.relativity/20.n2/10.an-euclidian-space-time/20.overview/cheatsheet.fr.md

@@ -939,8 +939,8 @@ choix des coordonnées xyt pour la prochiane figure
 <span style="font-family:'Times New Roman';font-weight:bold;font-size:1.15rem;text-align:left;color:#bbbbbb"> et noté</span>
 <span style="font-family:'Times New Roman';font-weight:bold;font-size:1.15rem;text-align:left;color:#bb3300"> s<sub>AB</sub></span><br>
 <span style="font-family:'Times New Roman';font-weight:bold;font-size:1.15rem;text-align:left;color:#bbbbbb">d'expression</span><br>
-<span style="font-family:'Times New Roman';font-weight:bold;font-size:0.85rem;text-align:left;color:#009900"">en coordonnées spatio-temporelles cartésiennes</span></p>
-$`\color{#009900}{s_{AB}=\sqrt{(c\,\Delta t_{AB})^2+(\Delta l_{AB})^2}}`$
+<span style="font-family:'Times New Roman';margin-left:30px;font-weight:bold;font-size:0.85rem;text-align:left;color:#009900"">en coordonnées spatio-temporelles cartésiennes</span></p>
+$`\mathbf{\color{#009900}{s_{AB}=\sqrt{(c\,\Delta t_{AB})^2+(\Delta l_{AB})^2}}}`$
 <p style="font-family:'Times New Roman';font-weight:bold;font-size:0.85rem;text-align:left;color:#bbbbbb">avec</p>
 $`\color{#009900}{\Delta l_{AB}=\sqrt{(x_B-x_A)^2+(y_B-y_A)^2+(z_B-z_A)^2}}`$
 $`\color{#009900}{\Delta t_{AB}=|t_B-t_A|=\sqrt{(t_B-t_A)^2}}`$