Fix FireFox overflows (#5000)

* Max width for container

* Set min-width

js/src/ui/Container/container.css

@@ -24,6 +24,7 @@ $transitionAll: all 0.75s cubic-bezier(0.23, 1, 0.32, 1);
   flex: 1;
   height: 100%;
   padding: 0em;
+  max-width: 100%;
   position: relative;
   /*transform: translateZ(0);
   transition: $transitionAll;*/

js/src/ui/SectionList/sectionList.css

@@ -18,6 +18,7 @@
 $transition: all 0.25s;
 $widthNormal: 33.33%;
 $widthExpanded: 42%;
+$widthContracted: 29%;
 
 .section {
   position: relative;
@@ -45,6 +46,7 @@ $widthExpanded: 42%;
       display: flex;
       flex: 0 1 $widthNormal;
       max-width: $widthNormal;
+      min-width: $widthContracted;
       opacity: 0.85;
       padding: 0.25em;