diff --git a/src/Admin.php b/src/Admin.php
index 037bbab..9d1bc1a 100644
--- a/src/Admin.php
+++ b/src/Admin.php
@@ -78,11 +78,12 @@ public function run(?string $locale, string $path): void
 			}
 			if (($assetType = ($path === 'assets/core.js') ? 'js' : null) || ($assetType = ($path === 'assets/core.css') ? 'css' : null)) { // route static assets from template directory
 				header('Content-Type: ' . Proxy::CONTENT_TYPES[$assetType]);
+				$assetContent = file_get_contents(__DIR__ . '/../template/assets/core.' . $assetType)
+					. (($customAssetPath = $this->context->getCustomAssetPath($assetType)) !== null ? "\n\n" . file_get_contents($customAssetPath) : '');
 				echo '/*' . "\n"
 					. ' * This file is part of Baraja CMS.' . "\n"
 					. ' */' . "\n\n"
-					. file_get_contents(__DIR__ . '/../template/assets/core.' . $assetType)
-					. (($customAssetPath = $this->context->getCustomAssetPath($assetType)) !== null ? "\n\n" . file_get_contents($customAssetPath) : '');
+					. ($assetType === 'css' ? Helpers::minifyHtml($assetContent) : $assetContent);
 				die;
 			}
 			if (strncmp($path, 'cms/', 4) !== 0 && $this->context->getUser()->isLoggedIn() === false) { // route login form
diff --git a/src/Helpers.php b/src/Helpers.php
index 273fb9d..75f2c5c 100644
--- a/src/Helpers.php
+++ b/src/Helpers.php
@@ -288,13 +288,17 @@ public static function escapeHtmlComment(string $s): string
 
 	public static function minifyHtml(string $haystack): string
 	{
-		return (string) preg_replace_callback(
+		$return = (string) preg_replace_callback(
 			'#[ \t\r\n]+|<(/)?(textarea|pre)(?=\W)#i',
-			static function (array $match) {
-				return empty($match[2]) ? ' ' : $match[0];
-			},
+			fn (array $match): string => empty($match[2]) ? ' ' : $match[0],
 			$haystack
 		);
+		$return = (string) preg_replace('/(\w|;)\s+({|})\s+(\w|\.|#)/', '$1$2$3', $return);
+		$return = str_replace(';}', '}', $return);
+		$return = (string) preg_replace('/(\w)\s*:\s+(\w|#|-|.)/', '$1:$2', $return);
+		$return = (string) preg_replace('/\s*\/\*+[^\*]+\*+\/\s*/', '', $return);
+
+		return $return;
 	}