Use better bower/grunt integration plugin.

_sass/vendor/bulma/sass/elements/container.sass

@@ -0,0 +1,23 @@
+$container-offset: (2 * $gap) !default
+
+.container
+  flex-grow: 1
+  margin: 0 auto
+  position: relative
+  width: auto
+  +desktop
+    max-width: $desktop - $container-offset
+    &.is-fluid
+      margin-left: $gap
+      margin-right: $gap
+      max-width: none
+  +until-widescreen
+    &.is-widescreen
+      max-width: $widescreen - $container-offset
+  +until-fullhd
+    &.is-fullhd
+      max-width: $fullhd - $container-offset
+  +widescreen
+    max-width: $widescreen - $container-offset
+  +fullhd
+    max-width: $fullhd - $container-offset