Fix full-width margins

app/javascript/flavours/glitch/styles/_mixins.scss

@@ -43,8 +43,8 @@
 
 @mixin fullwidth-gallery {
   &.full-width {
-    margin-left: -22px;
-    margin-right: -22px;
+    margin-left: -14px;
+    margin-right: -14px;
     width: inherit;
     max-width: none;
     height: 250px;