diff --git a/lib/Controller/CssController.php b/lib/Controller/CssController.php
index 3d3e28a..cd839fc 100644
--- a/lib/Controller/CssController.php
+++ b/lib/Controller/CssController.php
@@ -51,10 +51,6 @@ class CssController extends Controller
      */
     public function stylesheet()
     {
-        $requestUri = $this->request->server['REQUEST_URI'];
-        $assetsRoot = str_replace('/index.php', '', $requestUri);
-        $assetsRoot = preg_replace('#apps/side_menu/.*#s', 'apps/side_menu', $assetsRoot);
-
         $parameters = [
             'vars' => [
                 'background-color' => $this->config->getAppValue('side_menu', 'background-color', '#333333'),
@@ -63,7 +59,6 @@ class CssController extends Controller
                 'opener' => $this->config->getAppValue('side_menu', 'opener', 'side-menu-opener'),
             ],
             'display-logo' => (bool) $this->config->getAppValue('side_menu', 'display-logo', 1),
-            'assetsRoot' => $assetsRoot,
         ];
 
         $response = new TemplateResponse('side_menu', 'css/stylesheet', $parameters, 'blank');
diff --git a/templates/css/stylesheet.php b/templates/css/stylesheet.php
index b3348e8..7ff889f 100644
--- a/templates/css/stylesheet.php
+++ b/templates/css/stylesheet.php
@@ -1,7 +1,7 @@
 :root {
     <?php foreach ($_['vars'] as $key => $value): ?>
         <?php if ($key === 'opener'): ?>
-            --side-menu-<?php echo $key ?>: url('<?php echo $_['assetsRoot'] ?>/img/<?php echo $value ?>.svg');
+            --side-menu-<?php echo $key ?>: url('<?php print_unescaped(image_path('side_menu', $value.'.svg')); ?>');
         <?php else: ?>
             --side-menu-<?php echo $key ?>: <?php echo $value ?>;
         <?php endif; ?>