More consistent .center and toc alignment rules with other skins

Change-Id: I9005ed11bf2c70880088cfa41f7f6ebca974eb34

resources/screen-common.less

@@ -422,8 +422,7 @@ ul {
 	margin: 0.3em 0 0 1.6em;
 }
 
-.center,
-.center * {
+.center {
 	margin: auto;
 	text-align: center;
 }
@@ -464,7 +463,8 @@ ul#filetoc,
 	display: table;
 	.box;
 	padding: 1.25em 1.75em;
-	margin: 1em 0;
+	margin-top: 1em;
+	margin-bottom: 1em;
 	min-width: 15em;
 }
 ul#filetoc {
@@ -474,6 +474,7 @@ ul#filetoc {
 .toc ul {
 	margin: 1em 0 0;
 	list-style: none;
+	text-align: left;
 }
 .mw-body .toc h2 {
 	font-size: 1em;