Make sponsors fit in docs

docs/source/_templates/sponsors.html

@@ -15,11 +15,11 @@
         </a>
     </li>
     <li><a href="https://www.b1-systems.de/?utm_source=conversejs" target="_blank" rel="noopener">
-            <img style="width: 4em" src="/logo/b1-systems.svg" alt="B1 Systems">
+            <img style="height: 3em" src="/logo/b1-systems.svg" alt="B1 Systems">
         </a>
     </li>
     <li><a href="https://talentplot.com/?utm_source=conversejs" target="_blank" rel="noopener">
-            <img style="width: 10em" src="/logo/talentplot.svg" alt="Talentplot">
+            <img style="width: 9em" src="/logo/talentplot.svg" alt="Talentplot">
         </a>
     </li>
 </ul>