[BUGFIX] Fix height of body in backend

The body-tag had 100% height in the backend. In views, where scrolling
is possible (e.g. login screen in a small window), this made the
background-color stop too soon.

Resolves: #53692
Releases: 6.2
Change-Id: I08df23c808b6b4d1ea7422a25a2431cf18d0ae70
Reviewed-on: https://review.typo3.org/25460
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters

typo3/sysext/t3skin/Resources/Public/Css/structure/login_screen.css

@@ -5,7 +5,6 @@
  * Therefore preventing this notice from being properly shown is a violation of the license, regardless of whether you remove it or use the stylesheet to obstruct the display.
  */
 #typo3-index-php {
-	height: 100%;
 	margin: 0;
 }
 

typo3/sysext/t3skin/Resources/Public/Css/structure/main_body.css

@@ -4,7 +4,7 @@ body tags
 
 /* Set default values for bodytags: */
 body {
-	height: 100%;
+	min-height: 100%;
 	margin: 0;
 /*	overflow: hidden;*/
 	padding: 0;