fix first item (#606)

Author: Arhell

assets/css/custom.css

@@ -16,4 +16,9 @@
   .phalcon-blog__item-img img {
     object-fit: contain;
   }
+}
+
+.phalcon-blog__item-img img {
+  max-width: 100%;
+  height: auto;
 }