According to the described coding style the following changes were made. 

---
 html/html/themes/darkdos/include/functions.pl | 35 +++++++++----------
 .../themes/ipfire-legacy/include/functions.pl | 22 ++++++------
 html/html/themes/ipfire/include/functions.pl  |  2 +-
 html/html/themes/maniac/include/functions.pl  | 32 ++++++++---------
 4 files changed, 44 insertions(+), 47 deletions(-)

diff --git a/html/html/themes/darkdos/include/functions.pl b/html/html/themes/darkdos/include/functions.pl
index 9f3547237..6285ef8ba 100644
--- a/html/html/themes/darkdos/include/functions.pl
+++ b/html/html/themes/darkdos/include/functions.pl
@@ -48,7 +48,7 @@ EOF
 			</ul>
 		</div>
 EOF
-;    
+;
 }
 
 sub getselected($) {
@@ -141,7 +141,7 @@ sub openpage {
 
     $title = "-= IPFire - $title =-";
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title"; 
+        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title";
     }
 
     print <<END
@@ -154,7 +154,7 @@ sub openpage {
     <link rel="shortcut icon" href="/favicon.ico" />
     <link rel="stylesheet" type="text/css" href="/themes/darkdos/include/style.css" />
     <script language="javascript" type="text/javascript">
-      
+
         function swapVisibility(id) {
             el = document.getElementById(id);
             if(el.style.display != 'block') {
@@ -184,21 +184,21 @@ print <<END
 											t_current = new Date();
 											var t_diff = t_current - t_last;
 											t_last = t_current;
-				
+
 											rxb_current = \$("rxb",xml).text();
 											var rxb_diff = rxb_current - rxb_last;
 											rxb_last = rxb_current;
-				
+
 											var rx_kbs = rxb_diff/t_diff;
 											rx_kbs = Math.round(rx_kbs*10)/10;
-				
+
 											txb_current = \$("txb",xml).text();
 											var txb_diff = txb_current - txb_last;
 											txb_last = txb_current;
-				
+
 											var tx_kbs = txb_diff/t_diff;
 											tx_kbs = Math.round(tx_kbs*10)/10;
-				
+
 											\$("#rx_kbs").text(rx_kbs + ' kb/s');
 											\$("#tx_kbs").text(tx_kbs + ' kb/s');
 											}
@@ -227,7 +227,7 @@ print <<END
 END
 ;
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        print "<h1><span>$settings{'HOSTNAME'}.$settings{'DOMAINNAME'}</span></h1><br />"; 
+        print "<h1><span>$settings{'HOSTNAME'}.$settings{'DOMAINNAME'}</span></h1><br />";
     } else {
 				print "<h1><span><a href='https://www.ipfire.org' style='text-decoration: none;'>-= IPFire =-</a></span></h1><br />";
 		}
@@ -239,7 +239,7 @@ END
 ;
 	&showmenu();
 
-print <<END	
+print <<END
 	</div>
 </div>
 
@@ -264,7 +264,7 @@ sub openpagewithoutmenu {
 
     $title = "-= IPFire - $title =-";
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title"; 
+        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title";
     }
 
     print <<END
@@ -287,7 +287,7 @@ END
     <link rel="shortcut icon" href="/favicon.ico" />
     <link rel="stylesheet" type="text/css" href="/include/style.css" />
     <script language="javascript" type="text/javascript">
-      
+
         function swapVisibility(id) {
             el = document.getElementById(id);
   	    if(el.style.display != 'block') {
@@ -310,7 +310,7 @@ END
 		<div id="logo">
 			<h1><span>-= IPFire =-</span></h1>
 			<h2>+ $h2 +</h2>
-		</div>	
+		</div>
 	</div>
 </div>
 
@@ -330,14 +330,11 @@ sub closepage () {
 	$uptime =~ s/month(s|)/$Lang::tr{'month'}/;
 	$uptime =~ s/day(s|)/$Lang::tr{'day'}/;
 	$uptime =~ s/user(s|)/$Lang::tr{'user'}/;
-	$uptime =~ s/load average/$Lang::tr{'uptime load average'}/;     
-				
+	$uptime =~ s/load average/$Lang::tr{'uptime load average'}/;
     print <<END
 			</div>
 		</div>
-
 		<div id="secondaryContent_2columns">
-		
 			<div id="columnC_2columns">
 END
 ;
@@ -347,13 +344,13 @@ END
 	print <<END
 				</div>
 			</div>
-			<br class="clear" />	
+			<br class="clear" />
 			<div id="footer" class="fixed">
 				<b>Status:</b> $status <b>Uptime:</b> $uptime
 END
 ;
 if ($settings{'SPEED'} ne 'off') {
-print <<END                        
+print <<END
                         <br />
                                 <b>$Lang::tr{'bandwidth usage'}:</b>
 				$Lang::tr{'incoming'}: <span id="rx_kbs"></span>&nbsp;$Lang::tr{'outgoing'}: <span id="tx_kbs"></span>
diff --git a/html/html/themes/ipfire-legacy/include/functions.pl b/html/html/themes/ipfire-legacy/include/functions.pl
index 3ce62ea41..cc8dfa318 100644
--- a/html/html/themes/ipfire-legacy/include/functions.pl
+++ b/html/html/themes/ipfire-legacy/include/functions.pl
@@ -48,7 +48,7 @@ EOF
                         </ul>
                 </div>
 EOF
-;    
+;
 }
 
 sub getselected($) {
@@ -141,7 +141,7 @@ sub openpage {
 
     $title = "IPFire - $title";
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title"; 
+        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title";
     }
 
     print <<END
@@ -154,7 +154,7 @@ sub openpage {
     <link rel="shortcut icon" href="/favicon.ico" />
     <link rel="stylesheet" type="text/css" href="/themes/ipfire-legacy/include/style.css" />
     <script language="javascript" type="text/javascript">
-      
+
         function swapVisibility(id) {
             el = document.getElementById(id);
             if(el.style.display != 'block') {
@@ -227,7 +227,7 @@ print <<END
 END
 ;
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        print "<h1><span>$settings{'HOSTNAME'}.$settings{'DOMAINNAME'}</span></h1><br />"; 
+        print "<h1><span>$settings{'HOSTNAME'}.$settings{'DOMAINNAME'}</span></h1><br />";
     } else {
                                 print "<h1><span><a href='https://www.ipfire.org' style='text-decoration: none;'>IPFire</a></span></h1><br />";
                 }
@@ -239,7 +239,7 @@ END
 ;
         &showmenu();
 
-print <<END     
+print <<END
         </div>
 </div>
 
@@ -264,7 +264,7 @@ sub openpagewithoutmenu {
 
     $title = "IPFire - $title";
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title"; 
+        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title";
     }
 
     print <<END
@@ -287,7 +287,7 @@ END
     <link rel="shortcut icon" href="/favicon.ico" />
     <link rel="stylesheet" type="text/css" href="/include/style.css" />
     <script language="javascript" type="text/javascript">
-      
+
         function swapVisibility(id) {
             el = document.getElementById(id);
             if(el.style.display != 'block') {
@@ -310,7 +310,7 @@ END
                 <div id="logo">
                         <h1><span>IPFire</span></h1>
                         <h2>$h2</h2>
-                </div>  
+                </div>
         </div>
 </div>
 
@@ -337,7 +337,7 @@ sub closepage () {
                 </div>
 
                 <div id="secondaryContent_2columns">
-                
+
                         <div id="columnC_2columns">
 END
 ;
@@ -347,7 +347,7 @@ END
         print <<END
                                 </div>
                         </div>
-                        <br class="clear" />    
+                        <br class="clear" />
                         <div id="footer" class="fixed">
                                 <b>Status:</b> $status <b>Uptime:</b> $uptime
 END
@@ -356,7 +356,7 @@ if ($settings{'SPEED'} ne 'off') {
 print <<END
                         <br />
                                 <b>$Lang::tr{'bandwidth usage'}:</b>
-                                $Lang::tr{'incoming'}: <span id="rx_kbs"></span>&nbsp;$Lang::tr{'outgoing'}: <span id="tx_kbs"></span>                                                                            
+                                $Lang::tr{'incoming'}: <span id="rx_kbs"></span>&nbsp;$Lang::tr{'outgoing'}: <span id="tx_kbs"></span>
 				<b>time:</b> $localtime_now
 
 END
diff --git a/html/html/themes/ipfire/include/functions.pl b/html/html/themes/ipfire/include/functions.pl
index 9e3063476..108ce5f1a 100644
--- a/html/html/themes/ipfire/include/functions.pl
+++ b/html/html/themes/ipfire/include/functions.pl
@@ -40,7 +40,7 @@ use POSIX;
 # @param submenu entries
 sub showsubmenu() {
 	my $submenus = shift;
-	
+
 	print "<ul>";
 	foreach my $item (sort keys %$submenus) {
 		$link = getlink($submenus->{$item});
diff --git a/html/html/themes/maniac/include/functions.pl b/html/html/themes/maniac/include/functions.pl
index c50357070..2fbc3f53a 100644
--- a/html/html/themes/maniac/include/functions.pl
+++ b/html/html/themes/maniac/include/functions.pl
@@ -48,7 +48,7 @@ EOF
 			</ul>
 		</div>
 EOF
-;    
+;
 }
 
 sub getselected($) {
@@ -141,7 +141,7 @@ sub openpage {
 
     $title = "-= IPFire - $title =-";
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title"; 
+        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title";
     }
 
     print <<END
@@ -154,7 +154,7 @@ sub openpage {
     <link rel="shortcut icon" href="/favicon.ico" />
     <link rel="stylesheet" type="text/css" href="/themes/maniac/include/style.css" />
     <script type="text/javascript">
-      
+
         function swapVisibility(id) {
             el = document.getElementById(id);
             if(el.style.display != 'block') {
@@ -184,21 +184,21 @@ print <<END
 											t_current = new Date();
 											var t_diff = t_current - t_last;
 											t_last = t_current;
-				
+
 											rxb_current = \$("rxb",xml).text();
 											var rxb_diff = rxb_current - rxb_last;
 											rxb_last = rxb_current;
-				
+
 											var rx_kbs = rxb_diff/t_diff;
 											rx_kbs = Math.round(rx_kbs*10)/10;
-				
+
 											txb_current = \$("txb",xml).text();
 											var txb_diff = txb_current - txb_last;
 											txb_last = txb_current;
-				
+
 											var tx_kbs = txb_diff/t_diff;
 											tx_kbs = Math.round(tx_kbs*10)/10;
-				
+
 											\$("#rx_kbs").text(rx_kbs + ' kb/s');
 											\$("#tx_kbs").text(tx_kbs + ' kb/s');
 											}
@@ -227,7 +227,7 @@ print <<END
 END
 ;
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        print "<h1><span>$settings{'HOSTNAME'}.$settings{'DOMAINNAME'}</span></h1><br />"; 
+        print "<h1><span>$settings{'HOSTNAME'}.$settings{'DOMAINNAME'}</span></h1><br />";
     } else {
 				print "<h1><span><a href='https://www.ipfire.org' style='text-decoration: none;'>-= IPFire =-</a></span></h1><br />";
 		}
@@ -239,7 +239,7 @@ END
 ;
 	&showmenu();
 
-print <<END	
+print <<END
 	</div>
 </div>
 
@@ -264,7 +264,7 @@ sub openpagewithoutmenu {
 
     $title = "-= IPFire - $title =-";
     if ($settings{'WINDOWWITHHOSTNAME'} eq 'on') {
-        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title"; 
+        $title =  "$settings{'HOSTNAME'}.$settings{'DOMAINNAME'} - $title";
     }
 
     print <<END
@@ -287,7 +287,7 @@ END
     <link rel="shortcut icon" href="/favicon.ico" />
     <link rel="stylesheet" type="text/css" href="/include/style.css" />
     <script type="text/javascript">
-      
+
         function swapVisibility(id) {
             el = document.getElementById(id);
   	    if(el.style.display != 'block') {
@@ -310,7 +310,7 @@ END
 		<div id="logo">
 			<h1><span>-= IPFire =-</span></h1>
 			<h2>+ $h2 +</h2>
-		</div>	
+		</div>
 	</div>
 </div>
 
@@ -337,7 +337,7 @@ sub closepage () {
                 </div>
 
                 <div id="secondaryContent_2columns">
-                
+
                         <div id="columnC_2columns">
 END
 ;
@@ -347,7 +347,7 @@ END
         print <<END
                                 </div>
                         </div>
-                        <br class="clear" />    
+                        <br class="clear" />
                         <div id="footer" class="fixed">
                                 <b>Status:</b> $status <b>Uptime:</b> $uptime
 END
@@ -356,7 +356,7 @@ if ($settings{'SPEED'} ne 'off') {
 print <<END
                         <br />
                                 <b>$Lang::tr{'bandwidth usage'}:</b>
-                                $Lang::tr{'incoming'}: <span id="rx_kbs"></span>&nbsp;$Lang::tr{'outgoing'}: <span id="tx_kbs"></span>                                                                            
+                                $Lang::tr{'incoming'}: <span id="rx_kbs"></span>&nbsp;$Lang::tr{'outgoing'}: <span id="tx_kbs"></span>
                                 <b>time:</b> $localtime_now
 
 END
-- 
2.20.1