diff --git a/README.md b/README.md
index 9df03fa..4c19616 100644
--- a/README.md
+++ b/README.md
@@ -5,9 +5,7 @@
 [![WezomAgency](https://img.shields.io/badge/composer-require-orange.svg)](https://packagist.org/packages/wezom-agency/r2d2)
 [![WezomAgency](https://img.shields.io/badge/Wezom-Agency-red.svg)](https://github.com/WezomAgency)
 
-> R2D2 tiny helper
-
-<img src="https://raw.githubusercontent.com/dutchenkoOleg/storage/master/img/r2d2/r2d2.gif" alt>
+> tiny helper
 
 ---
 
@@ -35,7 +33,8 @@ WezomAgency\R2D2::eject()->set('KEY', VALUE);
 
 ### API
 
-[See docs sections ►](https://github.com/WezomAgency/r2d2/blob/master/docs/index.md)
+_Working in progress..._  
+[See draft docs sections ►](https://github.com/WezomAgency/r2d2/blob/master/docs/index.md)
 
 ---
 
diff --git a/src/WezomAgency/R2D2.php b/src/WezomAgency/R2D2.php
index f8cd4af..569dc42 100644
--- a/src/WezomAgency/R2D2.php
+++ b/src/WezomAgency/R2D2.php
@@ -75,12 +75,12 @@ public function attr($name, $value)
         }
 
         if (is_array($value) && $name === 'style') {
-            $css = $this->cssRules($value);
+            $css = $this->cssRules(array_filter($value));
             return $css ? 'style="' . $css . '"' : '';
         }
 
         if (is_array($value) && $name === 'class') {
-            return 'class="' . implode(' ', $value) . '"';
+            return 'class="' . implode(' ', array_filter($value)) . '"';
         }
 
         if (strpos($name, 'json-data-') === 0) {
@@ -101,14 +101,14 @@ public function attr($name, $value)
      */
     public function attrs($attrs)
     {
-        $markup = [];
+        $list = [];
         foreach ($attrs as $name => $value) {
-            $element = $this->attr($name, $value);
-            if (!is_null($element)) {
-                $markup[] = $element;
+            $attr = $this->attr($name, $value);
+            if (!is_null($attr)) {
+                $list[] = $attr;
             }
         }
-        return count($markup) > 0 ? ' ' . implode(' ', $markup) : '';
+        return count($list) > 0 ? ' ' . implode(' ', $list) : '';
     }