Reduce button width to reduce overflow

Note that at certain text scaling sizes other buttons overflow.

Fixes #566

index.html

@@ -411,7 +411,7 @@ <h3 class="customHeaderStyle">Convenient installation via Flatpak</h3>
           </figure>
           <p>Do you use a GNU/Linux? Available for any distribution, individual Sugar activities can be conveniently installed via Flatpak.</p>
 	  <br>
-          <a href="https://flathub.org/apps/search?q=sugar%20labs"><button type="button" class="btn bt-raised btn-custom bt customMargin4">Search Sugar Activities on Flatpak</button></a> <!--TODO: Create a new page for more info page for Sugar Activities on Flatpak. -->
+          <a href="https://flathub.org/apps/search?q=sugar%20labs"><button type="button" class="btn bt-raised btn-custom bt customMargin4">Sugar Activities on Flatpak</button></a> <!--TODO: Create a new page for more info page for Sugar Activities on Flatpak. -->
 	</div>
       </div>
     </div>