diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 4f2f0b39a9..e8c3c370eb 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -21,6 +21,7 @@ Changelog
  * Fix: StructBlock values no longer render HTML templates as their `str` representation, to prevent infinite loops in debugging / logging tools (Matt Westcott)
  * Fix: Removed deprecated jQuery ``load`` call from TableBlock initialisation (Jack Paine)
  * Fix: Position of options in mobile nav-menu (Jack Paine)
+ * Fix: Center page editor footer regardless of screen width (Jack Paine)
 
 
 1.11.1 (07.07.2017)
diff --git a/docs/releases/1.12.rst b/docs/releases/1.12.rst
index 9cf31eec79..527e6473f4 100644
--- a/docs/releases/1.12.rst
+++ b/docs/releases/1.12.rst
@@ -41,6 +41,7 @@ Bug fixes
  * StructBlock values no longer render HTML templates as their ``str`` representation, to prevent infinite loops in debugging / logging tools (Matt Westcott)
  * Removed deprecated jQuery ``load`` call from TableBlock initialisation (Jack Paine)
  * Position of options in mobile nav-menu (Jack Paine)
+ * Center page editor footer regardless of screen width (Jack Paine)
 
 Upgrade considerations
 ======================
diff --git a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss
index 7ce94a2188..d0a03427a3 100644
--- a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss
+++ b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss
@@ -435,8 +435,9 @@ footer,
     }
 
     footer {
-        width: 80%;
-        margin-left: 50px;
+        margin-left: $desktop-nice-padding;
+        margin-right: $desktop-nice-padding;
+        width: calc(100% - #{$menu-width} - #{2 * $desktop-nice-padding});
     }
 
     .content {
@@ -461,11 +462,6 @@ footer,
         }
     }
 
-    footer {
-        width: 80%;
-        margin-left: 50px;
-    }
-
 
     // Z-indexes
     .nav-main {