diff --git a/Slideshow.js b/Slideshow.js
index 580c18f..2079ff5 100644
--- a/Slideshow.js
+++ b/Slideshow.js
@@ -366,7 +366,7 @@ const iconArrow = function (iconHeight) {
   return {
      width: 0,
      height: 0,
-     margin: 5,
+     margin: 0,
      backgroundColor: 'transparent',
      borderStyle: 'solid',
      borderTopColor: 'transparent',
diff --git a/package.json b/package.json
index f0f3ac1..3f2b52d 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,9 @@
     "native",
     "slideshow"
   ],
+  "dependencies": {
+    "prop-types": "~15.6.1"
+  },
   "author": "M. Asrof Bayhaqqi <masrofbayhaqqi@gmail.com>",
   "license": "MIT",
   "bugs": {