diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index d8e3e22303..e9a86b8bd5 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -13,6 +13,7 @@ Changelog
  * Fix: Locked pages can no longer be unpublished (Alex Bridge)
  * Fix: Site records now implement `get_by_natural_key`
  * Fix: Creating pages at the root level (and any other instances of the base `Page` model) now properly respects the `parent_page_types` setting
+ * Fix: Settings menu now opens correctly from the page editor and styleguide views
 
 1.2 (12.11.2015)
 ~~~~~~~~~~~~~~~~
diff --git a/docs/releases/1.3.rst b/docs/releases/1.3.rst
index 8db041b2a9..28426fa368 100644
--- a/docs/releases/1.3.rst
+++ b/docs/releases/1.3.rst
@@ -28,6 +28,7 @@ Bug fixes
  * Locked pages can no longer be unpublished (Alex Bridge)
  * Site records now implement ``get_by_natural_key``
  * Creating pages at the root level (and any other instances of the base ``Page`` model) now properly respects the `parent_page_types` setting
+ * Settings menu now opens correctly from the page editor and styleguide views
 
 
 Upgrade considerations
diff --git a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/icons.scss b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/icons.scss
index 188b6af3f8..26bab4a731 100644
--- a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/icons.scss
+++ b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/icons.scss
@@ -264,8 +264,6 @@
 .icon-spinner:after {
     width: 1em;
     animation: spin 0.5s infinite linear;
-    -webkit-animation: spin 0.5s infinite linear;
-    -moz-animation: spin 0.5s infinite linear;
     content: '1';
 }
 
@@ -376,23 +374,3 @@
         transform: rotate(360deg);
     }
 }
-
-@-webkit-keyframes spin {
-    from {
-        -webkit-transform: rotate(0deg);
-    }
-
-    to {
-        -webkit-transform: rotate(360deg);
-    }
-}
-
-@-moz-keyframes spin {
-    from {
-        -moz-transform: rotate(0deg);
-    }
-
-    to {
-        -moz-transform: rotate(360deg);
-    }
-}
diff --git a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/main-nav.scss b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/main-nav.scss
index 7a63bc77fd..363a95e0fd 100644
--- a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/main-nav.scss
+++ b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/main-nav.scss
@@ -324,6 +324,7 @@ body.explorer-open {
     }
 
     .nav-submenu {
+        transform: translate3d(0, 0, 0);
         position: fixed;
         height: 100%;
         width: 0;