Merge remote-tracking branch 'origin/MAGETWO-38407' into PR

Author: Natalia Momotenko

app/design/adminhtml/Magento/backend/Magento_Backend/web/css/source/module/_menu.less

@@ -52,7 +52,7 @@
 //  ---------------------------------------------
 
 .menu-wrapper {
-    float: left;
+    display: inline-block;
     position: relative;
     width: @menu__width;
     z-index: @menu__z-index;
@@ -205,7 +205,7 @@
             min-height: ~'calc(@{menu-logo__outer-size} + 2rem + 100%)';
             padding: @submenu__padding-vertical 0 0;
             position: absolute;
-            top: -@menu-logo__outer-size;
+            top: 0;
             transform: translateX(-100%);
             transition-property: transform, visibility;
             transition-duration: .3s;

app/design/adminhtml/Magento/backend/Magento_Backend/web/css/source/module/pages/_login.less

@@ -35,6 +35,7 @@
         background-color: @login-box__background-color;
         border: @login-box__border;
         box-shadow: @login-box__shadow;
+        display: block;
         float: none;
         margin: auto;
         max-width: @login-box__max-width;

app/design/adminhtml/Magento/backend/web/css/source/_structure.less

@@ -38,7 +38,9 @@ body {
 
 .page-wrapper {
     background-color: @page-wrapper__background-color;
-    float: left;
+    display: inline-block;
+    margin-left: -4px; // Clear inline-block gap
+    vertical-align: top;
     width: ~'calc(100% - @{menu__width})';
 }