Administration: CSS coding standards

- properties should be followed by a colon and a space
- media queries shouldn't use spaces within parenthesis
- indentation should use tabs instead of spaces or mixed spaces / tabs
- the content property should use double quotes
- no double spaces

Props nadim0988, afercia.
Fixes #45185.

Built from https://develop.svn.wordpress.org/trunk@44637


git-svn-id: http://core.svn.wordpress.org/trunk@44468 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/install.css

@@ -63,7 +63,7 @@ ul, ol, dl {
 }
 
 a img {
-	border:0
+	border: 0
 }
 abbr {
 	border: 0;
@@ -84,7 +84,7 @@ label {
 	margin: 6px 0 14px 0;
 	padding: 0 0 7px 0;
 	border-bottom: none;
-	text-align:center
+	text-align: center
 }
 #logo a {
 	background-image: url(../images/w-logo-blue.png?ver=20131202);
@@ -330,7 +330,7 @@ body.rtl,
 	}
 }
 
-@media screen and ( max-width: 782px ) {
+@media screen and (max-width: 782px) {
 
 	.form-table {
 		margin-top: 0;