Make columns shrink equally/make sure they are equal width even on na…

…rrow screens, by giving them all the same basis.

See https://css-tricks.com/equal-columns-with-flexbox-its-more-complicated-than-you-might-think/

"flex-shrink is a ratio. If everything has the same flex-shrink (which is 1 by default), they all shrink at the same rate. That doesn�t mean they all shrink to the same size or by the same amount, but they all shrink at the same rate."

main.sass

@@ -128,7 +128,7 @@ ul
     width: calc(100% - 6px)
     gap: 10px
     > *
-        flex: 1
+        flex: 1 1 100%
         max-height: 100%
 
 .scrollParent