diff --git a/about/index.php b/about/index.php
index 4dd38d2..cfb0a6b 100644
--- a/about/index.php
+++ b/about/index.php
@@ -1,11 +1,11 @@
 <!DOCTYPE html>
 <html lang="en">
 	<head>
-		<? require "../inc/head.inc" ?>
+		<?php require "../inc/head.inc" ?>
 	</head>
 	<body>
 
-	    <? require "../inc/nav.inc" ?>
+	    <?php require "../inc/nav.inc" ?>
 
 		<div id="main-and-sidebar" class="inline-block">
 
@@ -73,11 +73,11 @@
 				</div>
 			</div><!--
 
-			--><? require "../inc/sidebar.inc" ?>
+			--><?php require "../inc/sidebar.inc" ?>
 
 		</div>
 
-		<? require "../inc/background.inc" ?>
+		<?php require "../inc/background.inc" ?>
 
 	</body>
 </html>
diff --git a/background/index.php b/background/index.php
index 467ba31..df25c87 100644
--- a/background/index.php
+++ b/background/index.php
@@ -1,9 +1,9 @@
 <!DOCTYPE html>
 <html lang="en">
 	<head>
-		<? require "../inc/head.inc" ?>
+		<?php require "../inc/head.inc" ?>
 	</head>
 	<body>
-		<? require "../inc/background.inc" ?>
+		<?php require "../inc/background.inc" ?>
 	</body>
-</html>
\ No newline at end of file
+</html>
diff --git a/inc/head.inc b/inc/head.inc
index 61f80be..cc71824 100644
--- a/inc/head.inc
+++ b/inc/head.inc
@@ -7,14 +7,14 @@
 <meta http-equiv="X-UA-Compatible" content="IE=Edge">
 <title>Reimar</title>
 <link rel="stylesheet" href="/assets/style/main.css" onload="linkOnloadSupported = true">
-<? if ($_COOKIE["theme"] == "dark") : ?>
+<?php if ($_COOKIE["theme"] == "dark") : ?>
 	<link class="theme-style" rel="stylesheet" href="/assets/style/dark-mode.css">
-<? else : ?>
+<?php else : ?>
 	<link class="theme-style" rel="stylesheet" href="/assets/style/light-mode.css">
-<? endif ?>
-<? if (!$_COOKIE["theme"]) : ?>
+<?php endif ?>
+<?php if (!$_COOKIE["theme"]) : ?>
 	<style>@import "/assets/style/dark-mode.css" (prefers-color-scheme: dark)</style>
-<? endif ?>
+<?php endif ?>
 <!--[if lt IE 6]><style>.container { box-shadow: none !important; }</style><![endif]-->
 <!--[if lte IE 9]>
     <script src="/assets/script/compatibility.js"></script>
diff --git a/index.php b/index.php
index 021a938..e8c9baf 100644
--- a/index.php
+++ b/index.php
@@ -4,11 +4,11 @@
 <!DOCTYPE html>
 <html lang="en">
     <head>
-		<? require "inc/head.inc" ?>
+		<?php require "inc/head.inc" ?>
     </head>
     <body>
 
-        <? require "inc/nav.inc" ?>
+        <?php require "inc/nav.inc" ?>
 
         <div id="main-and-sidebar" dir="rtl" class="inline-block">
 
@@ -80,11 +80,11 @@
                 </div>
             </div><!--
 
-            --><? require "inc/sidebar.inc" ?>
+            --><?php require "inc/sidebar.inc" ?>
 
         </div>
 
-		<? require "inc/background.inc" ?>
+		<?php require "inc/background.inc" ?>
 
     </body>
 </html>
