diff --git a/resources/compiled_coffeescript.zip b/resources/compiled_coffeescript.zip
index 615531f233..5e9f6ae63b 100644
Binary files a/resources/compiled_coffeescript.zip and b/resources/compiled_coffeescript.zip differ
diff --git a/src/calibre/ebooks/oeb/display/paged.coffee b/src/calibre/ebooks/oeb/display/paged.coffee
index 6a922ac043..7de9817d03 100644
--- a/src/calibre/ebooks/oeb/display/paged.coffee
+++ b/src/calibre/ebooks/oeb/display/paged.coffee
@@ -152,9 +152,9 @@ class PagedDisplay
 
         fgcolor = body_style.getPropertyValue('color')
 
-        bs.setProperty('-webkit-column-gap', (2*sm)+'px')
-        bs.setProperty('-webkit-column-width', col_width+'px')
-        bs.setProperty('-webkit-column-rule-color', fgcolor)
+        bs.setProperty('-webkit-column-gap', 2*sm + 'px')
+        bs.setProperty('-webkit-column-width', col_width + 'px')
+        bs.setProperty('-webkit-column-rule', '0px inset blue')
 
         # Without this, webkit bleeds the margin of the first block(s) of body
         # above the columns, which causes them to effectively be added to the
@@ -231,6 +231,14 @@ class PagedDisplay
             if is_single_page
                 this.is_full_screen_layout = true
 
+        ncols = document.body.scrollWidth / this.page_width
+        if ncols != Math.floor(ncols) and not this.is_full_screen_layout
+            # In Qt 5 WebKit will sometimes adjust the individual column widths for
+            # better text layout. This is allowed as per the CSS spec, so the
+            # only way to ensure fixed column widths is to make sure the body
+            # width is an exact multiple of the column widths
+            bs.setProperty('width', Math.floor(ncols) * this.page_width - 2 * sm)
+
         this.in_paged_mode = true
         this.current_margin_side = sm
         # log('Time to layout:', new Date().getTime() - start_time)