Remove fixed footer at first media break (fixes #2454)

After the first media break (under 1200px), the footer is too long to
fit in a single line, taking up too much space in small screen devices.
This makes it so that it will stop being fixed at the bottom, freeing up
valuable screen real estate.

gui/assets/css/overrides.css

@@ -245,7 +245,7 @@ ul.three-columns li, ul.two-columns li {
 
 /** Footer nav on small devices **/
 
-@media (max-width: 991px) {
+@media (max-width: 1199px) {
     body {
         padding-bottom: 0;
     }