diff --git a/README.md b/README.md
index 452d6326..27dd0147 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,17 @@ A web frontal that allows:
   | -------------------- | -------------------- |
   | ![Screen 3][screen3] | ![Screen 4][screen4] |
 
+### Maintenance
+With the work of [jokobsk/Pi.Alert](https://github.com/jokob-sk/Pi.Alert) and own extensions, various possibilities for 
+maintenance and settings are available on this page:
+  - DB Backup and Restore
+  - Theme Selection (blue, red, green, yellow, black, purple)
+  - Light/Dark-Mode Switch
+  - DB maintenance tools
+
+In addition, some information is available (active scans, database size, backup counter).
+
+![Maintain screen dark][maintain_dark]
 
 # Installation
 <!--- --------------------------------------------------------------------- --->
@@ -137,4 +148,5 @@ Linux distributions.
 [report1]: ./docs/img/4_report_1.jpg          "Report sample 1"
 [report2]: ./docs/img/4_report_2.jpg          "Report sample 2"
 [main_dark]: /docs/img/1_devices_dark.jpg     "Main screen dark"
+[maintain_dark]: /docs/img/5_maintain.jpg     "Maintain screen dark"
 
diff --git a/docs/img/5_maintain.jpg b/docs/img/5_maintain.jpg
new file mode 100644
index 00000000..98ec38b9
Binary files /dev/null and b/docs/img/5_maintain.jpg differ
diff --git a/front/css/pialert.css b/front/css/pialert.css
index a56fae81..8b6bf4bf 100644
--- a/front/css/pialert.css
+++ b/front/css/pialert.css
@@ -119,6 +119,18 @@
     margin-left: 0px;
   }
 
+  .fix_maintain_section {
+    min-height: 650px;
+  }
+
+}
+
+
+@media (max-width: 520px) {
+  .fix_maintain_section {
+    min-height: 900px;
+  }
+
 }
 
 .sidebar-open .content-wrapper, .sidebar-open .main-footer {
@@ -453,7 +465,7 @@
 }
 
 .dbtools-button {
-  margin: 5px; display: inline-block; width: 140px; height: 100px; white-space: normal; word-wrap: break-word; font-size: 16px; border-radius: 10px;
+  margin: 5px; display: inline-block; width: 140px; height: 100px; white-space: normal; word-wrap: break-word; font-size: 16px; border-radius: 10px; margin-bottom: 25px;
 }
 
 .db_info_table_cell:nth-child(1) {background: white}
@@ -469,6 +481,7 @@
    margin: auto;
    margin-top: 40px;
    margin-bottom: 40px;
+   border: solid 1px #ddd;
 }
 .db_info_table_row {display: table-row; padding: 3px; }
 .db_info_table_cell {display: table-cell; padding: 3px; padding-left: 10px;}
diff --git a/front/img/manifest.json b/front/img/manifest.json
index b9567963..0e0dfe2c 100644
--- a/front/img/manifest.json
+++ b/front/img/manifest.json
@@ -2,6 +2,13 @@
     "name": "Pi-Alert Console",
     "short_name": "Pi-Alert",
     "display": "standalone",
-    "theme_color": "#367fa9",
-    "background_color": "#367fa9"
+    "icons": [
+    {
+      "src": "",
+      "sizes": "180x180",
+      "type": "image/png"
+    }
+    ],
+    "theme_color": "#000",
+    "background_color": "#000"
 }
diff --git a/front/maintenance.php b/front/maintenance.php
index b26de1e2..a37f27a6 100644
--- a/front/maintenance.php
+++ b/front/maintenance.php
@@ -28,7 +28,7 @@
     </section>
 
     <!-- Main content ---------------------------------------------------------- -->
-    <section class="content" style="min-height: 600px;">
+    <section class="content fix_maintain_section" style="height: 100%;">
 
 
   <?php
@@ -59,6 +59,35 @@ natsort($latestfiles);
 $latestfiles = array_reverse($latestfiles,False);
 $latestbackup = $latestfiles[0];
 $latestbackup_date = date ("Y-m-d H:i:s", filemtime($latestbackup));
+
+if (submit) {
+  $pia_skin_set_dir = '../db/';
+  $pia_skin_selector = htmlspecialchars($_POST['skinselector']);
+  $pia_installed_skins = array('skin-black-light', 'skin-black', 'skin-blue-light', 'skin-blue', 'skin-green-light', 'skin-green', 'skin-purple-light', 'skin-purple', 'skin-red-light', 'skin-red', 'skin-yellow-light', 'skin-yellow',);
+  if (in_array($pia_skin_selector, $pia_installed_skins)) {
+    foreach ($pia_installed_skins as $file) {
+      unlink ($pia_skin_set_dir.'/'.$file);
+    }
+
+    foreach ($pia_installed_skins as $file) {
+      if (file_exists($pia_skin_set_dir.'/'.$file)) {
+          $pia_skin_error = True;
+          break;
+      } else {
+          $pia_skin_error = False;
+      }
+    }
+
+    if ($pia_skin_error == False) {
+      $testskin = fopen($pia_skin_set_dir.$pia_skin_selector, 'w');
+      $pia_skin_test = '';
+      echo("<meta http-equiv='refresh' content='1'>"); 
+    } else {
+      $pia_skin_test = '';
+      echo("<meta http-equiv='refresh' content='1'>");
+    }    
+  }
+}
   ?>
 
 <div class="db_info_table">
@@ -88,10 +117,36 @@ $latestbackup_date = date ("Y-m-d H:i:s", filemtime($latestbackup));
 </div>
 </div>
 
+<form method="post" action="maintenance.php">
+<div class="db_info_table">
+  <div class="db_info_table_row">
+      <div class="db_info_table_cell" style="height:50px; text-align:center; vertical-align: middle;">
+        <div style="display: inline-block; margin-right: 10px;">Theme Selection:</div> 
+        <div style="display: inline-block;">
+            <select name="skinselector">
+                <option value="">--Choose a theme--</option>
+                <option value="skin-black-light">black light</option>
+                <option value="skin-black">black</option>
+                <option value="skin-blue-light">blue light</option>
+                <option value="skin-blue">blue</option>
+                <option value="skin-green-light">green light</option>
+                <option value="skin-green">green</option>
+                <option value="skin-purple-light">purple light</option>
+                <option value="skin-purple">purple</option>
+                <option value="skin-red-light">red light</option>
+                <option value="skin-red">red</option>
+                <option value="skin-yellow-light">yellow light</option>
+                <option value="skin-yellow">yellow</option>
+            </select></div> 
+        <div style="display: inline-block;"><input type="submit" value="Set"><?php echo $pia_skin_test; ?></div>
+      </div>
+  </div>
+</div>
+</form>
 
-    <div class="col-xs-12" style="text-align:center; padding-top: 10px; margin-bottom: 50px;">
+    <div class="col-xs-12" style="text-align:center; padding-top: 10px;">
 
-          <button type="button" class="btn btn-default pa-btn pa-btn-delete bg-green dbtools-button" id="btnPiaEnableDarkmode" style="border-top: solid 3px #00a65a;" onclick="askPiaEnableDarkmode()">Switch Themes (Dark/Light)</button>
+          <button type="button" class="btn btn-default pa-btn pa-btn-delete bg-green dbtools-button" id="btnPiaEnableDarkmode" style="border-top: solid 3px #00a65a;" onclick="askPiaEnableDarkmode()">Switch Modes (Dark/Light)</button>
 
           <button type="button" class="btn btn-default pa-btn pa-btn-delete bg-red dbtools-button" id="btnDeleteMAC" style="border-top: solid 3px #dd4b39;" onclick="askDeleteDevicesWithEmptyMACs()">Delete Devices with empty MACs</button>
 
diff --git a/front/php/server/devices.php b/front/php/server/devices.php
index ef231d93..abee84d2 100644
--- a/front/php/server/devices.php
+++ b/front/php/server/devices.php
@@ -272,7 +272,7 @@ function PiaBackupDBtoArchive() {
 
   // copy files as a fast Backup
   if (!copy($file, $newfile)) {
-      echo "The Backup executed not successfully";
+      echo "The original database could not be saved.";
   } else {
     // Create archive with actual date
     $Pia_Archive_Name = 'pialertdb_'.date("Ymd_His").'.zip';
@@ -282,8 +282,9 @@ function PiaBackupDBtoArchive() {
     if (file_exists($Pia_Archive_Path.$Pia_Archive_Name) && filesize($Pia_Archive_Path.$Pia_Archive_Name) > 0) {
       echo 'The backup executed successfully with the new archive: ('.$Pia_Archive_Name.')';
       unlink($newfile);
+      echo("<meta http-equiv='refresh' content='1'>");
     } else {
-      echo 'Test backup executed partially successfully. The archive could not be created or is empty. (pialert.db.latestbackup)';
+      echo 'The backup executed partially successfully. The archive could not be created or is empty. (pialert.db.latestbackup)';
     }
   }
 
@@ -299,7 +300,7 @@ function PiaRestoreDBfromArchive() {
 
   // copy files as a fast Backup
   if (!copy($file, $oldfile)) {
-      echo "Test Function executed not successfully";
+      echo 'The original database could not be saved.';
   } else {
     // extract latest archive and overwrite the actual pialert.db
     $Pia_Archive_Path = '../../../db/';
@@ -308,6 +309,7 @@ function PiaRestoreDBfromArchive() {
     if (file_exists($file)) {
        echo 'Restore executed successfully';
        unlink($oldfile);
+       echo("<meta http-equiv='refresh' content='1'>");
      } else {
        echo 'Restore Failed. Please restore the backup manually.';
      }
diff --git a/front/php/templates/header.php b/front/php/templates/header.php
index 8228f4fe..662ab471 100644
--- a/front/php/templates/header.php
+++ b/front/php/templates/header.php
@@ -8,9 +8,14 @@
 #--------------------------------------------------------------------------- -->
 
 <?php
+
 if (file_exists('../db/darkmode')) {
     $ENABLED_DARKMODE = True;
 }
+foreach (glob("../db/skin*") as $filename) {
+    $pia_skin_selected = basename($filename);
+}
+if (strlen($pia_skin_selected) == 0) {$pia_skin_selected = 'skin-blue';}
 ?>
 
 <!DOCTYPE html> 
@@ -42,7 +47,7 @@ if (file_exists('../db/darkmode')) {
   <!-- AdminLTE Skins. We have chosen the skin-blue for this starter
         page. However, you can choose any other skin. Make sure you
         apply the skin class to the body tag so the changes take effect. -->
-  <link rel="stylesheet" href="lib/AdminLTE/dist/css/skins/skin-blue.min.css">
+  <link rel="stylesheet" href="lib/AdminLTE/dist/css/skins/<?php echo $pia_skin_selected;?>.min.css">
 
   <!-- Pi.Alert CSS -->
   <link rel="stylesheet" href="css/pialert.css">
@@ -61,7 +66,7 @@ if (file_exists('../db/darkmode')) {
 
   <!-- For better UX on Mobile Devices using the Shortcut on the Homescreen -->
   <link rel="manifest" href="img/manifest.json">
-
+  <link rel="apple-touch-icon" href="https://net-dev.de/pialert_homescreen.png">
   <!-- Dark-Mode Patch -->
 <?php
 if ($ENABLED_DARKMODE === True) {
@@ -93,7 +98,7 @@ function show_pia_servertime() {
 
 <!-- ----------------------------------------------------------------------- -->
 <!-- Layout Boxed Yellow -->
-<body class="hold-transition skin-blue layout-boxed sidebar-mini" <?php echo $BACKGROUND_IMAGE_PATCH;?> onLoad="show_pia_servertime();" >
+<body class="hold-transition <?php echo $pia_skin_selected;?> layout-boxed sidebar-mini" <?php echo $BACKGROUND_IMAGE_PATCH;?> onLoad="show_pia_servertime();" >
 <!-- Site wrapper -->
 <div class="wrapper">