diff --git a/.stylelintrc.json b/.stylelintrc.json
new file mode 100644
index 0000000000000..52955abb04f60
--- /dev/null
+++ b/.stylelintrc.json
@@ -0,0 +1,7 @@
+{
+	"rules": {
+		"block-no-empty": true,
+		"length-zero-no-unit": true,
+		"property-no-unknown": true
+	}
+}
diff --git a/Gruntfile.js b/Gruntfile.js
index 61f18481e23a8..ca128d09971f1 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1760,7 +1760,29 @@ module.exports = function(grunt) {
 		'qunit:compiled'
 	] );
 
+	grunt.registerTask( 'lint:css', 'Runs Stylelint on core CSS.', function() {
+		var done = this.async();
+
+		grunt.util.spawn( {
+			cmd: 'npx',
+			args: [
+				'wp-scripts',
+				'lint-style',
+				SOURCE_DIR + 'wp-admin/css/*.css',
+				SOURCE_DIR + 'wp-includes/css/*.css',
+				'--ignore-pattern',
+				'**/*.min.css',
+				'--ignore-pattern',
+				'**/*-rtl.css'
+			],
+			opts: { stdio: 'inherit' }
+		}, function( error ) {
+			done( ! error );
+		} );
+	} );
+
 	grunt.registerTask( 'precommit:css', [
+		'lint:css',
 		'postcss:core'
 	] );
 
@@ -1835,7 +1857,7 @@ module.exports = function(grunt) {
 				}
 
 				if ( code === 0 ) {
-					if ( [ 'package.json', 'Gruntfile.js', 'composer.json' ].some( testPath ) ) {
+					if ( [ 'package.json', 'Gruntfile.js', 'composer.json', '.stylelintrc.json' ].some( testPath ) ) {
 						grunt.log.writeln( 'Configuration files modified. Running `prerelease`.' );
 						taskList.push( 'prerelease' );
 					} else {
diff --git a/src/wp-admin/css/list-tables.css b/src/wp-admin/css/list-tables.css
index 8b03e3c08d353..59b413ea56423 100644
--- a/src/wp-admin/css/list-tables.css
+++ b/src/wp-admin/css/list-tables.css
@@ -1986,7 +1986,7 @@ div.action-links,
 
 	.plugins .active th.check-column input,
 	.plugins .active td.check-column input {
-		margin-left: 0px;
+		margin-left: 0;
 	}
 
 	.plugins tr.active,
diff --git a/src/wp-includes/css/media-views.css b/src/wp-includes/css/media-views.css
index 6748a50f00c57..b821add957e1b 100644
--- a/src/wp-includes/css/media-views.css
+++ b/src/wp-includes/css/media-views.css
@@ -336,7 +336,7 @@
 	grid-template-columns: repeat( 2, 1fr );
 	grid-template-rows: repeat( 2, 1fr );
 	grid-column-gap: 12px;
-	grid-row-gap: 0px;
+	grid-row-gap: 0;
 	align-items: end;
 }
 
@@ -564,7 +564,7 @@ select#media-attachment-filters ~ select#media-attachment-date-filters {
 	width: 16px;
 	height: 16px;
 	font-size: 16px;
-	margin-top: 0px;
+	margin-top: 0;
 }
 
 .media-sidebar .setting .value,