diff --git a/install/core/Installer.php b/install/core/Installer.php
index 8f636f8462..803315155b 100644
--- a/install/core/Installer.php
+++ b/install/core/Installer.php
@@ -83,6 +83,7 @@ class Installer
         'outboundEmailFromName',
         'outboundEmailFromAddress',
         'outboundEmailIsShared',
+        'theme',
     ];
 
     public function __construct()
@@ -237,7 +238,15 @@ class Installer
         return $this->app->isInstalled();
     }
 
-    private function getLanguage(): Language
+    public function createLanguage(string $language): Language
+    {
+        return $this->app
+            ->getContainer()
+            ->get('injectableFactory')
+            ->createWith(Language::class, ['language' => $language]);
+    }
+
+    public function getLanguage(): Language
     {
         if (!isset($this->language)) {
             try {
@@ -255,6 +264,14 @@ class Installer
         return $this->language;
     }
 
+    public function getThemeList(): array
+    {
+        return [
+            'HazyblueVertical',
+            'DarkVertical',
+        ];
+    }
+
     public function getLanguageList($isTranslated = true): array
     {
         $languageList = $this->getMetadata()->get(['app', 'language', 'list']);
@@ -349,6 +366,7 @@ class Installer
             'passwordSalt' => $this->getPasswordHash()->generateSalt(),
             'cryptKey' => $this->getContainer()->get('crypt')->generateKey(),
             'hashSecretKey' => Util::generateSecretKey(),
+            'theme' => $saveData['theme'] ?? 'HazyblueVertical',
         ];
 
         if (empty($saveData['defaultPermissions']['user'])) {
@@ -528,6 +546,7 @@ class Installer
             'thousandSeparator',
             'decimalMark',
             'language',
+            'theme',
         ];
 
         $data = array_intersect_key($preferences, array_flip($permittedSettingList));
@@ -605,6 +624,11 @@ class Installer
                     case 'language':
                         $settingDefs['language']['options'] = $this->getLanguageList(false);
 
+                        break;
+
+                    case 'theme':
+                        $settingDefs['theme']['options'] = $this->getThemeList();
+
                         break;
                 }
 
diff --git a/install/core/actions/checkPermission.php b/install/core/actions/checkPermission.php
index ec7d6e4db9..c35a0f0562 100644
--- a/install/core/actions/checkPermission.php
+++ b/install/core/actions/checkPermission.php
@@ -28,31 +28,48 @@
  ************************************************************************/
 
 ob_start();
-$result = array('success' => true, 'errorMsg' => '');
+
+$result = ['success' => true, 'errorMsg' => ''];
 
 if (!$installer->checkPermission()) {
     $result['success'] = false;
     $error = $installer->getLastPermissionError();
+
     $urls = array_keys($error);
-    $group = array();
-    foreach($error as $folder => $permission) {
+
+    $group = [];
+
+    foreach ($error as $folder => $permission) {
         $group[implode('-', $permission)][] = $folder;
     }
+
     ksort($group);
+
     $instruction = '';
     $instructionSU = '';
     $changeOwner = true;
+
     foreach($group as $permission => $folders) {
-        if ($permission == '0644-0755') $folders = '';
-        $instruction .= $systemHelper->getPermissionCommands(array($folders, ''), explode('-', $permission), false, null, $changeOwner) . "<br>";
-        $instructionSU .= $systemHelper->getPermissionCommands(array($folders, ''), explode('-', $permission), true, null, $changeOwner) . "<br>";
+        if ($permission == '0644-0755') {
+            $folders = '';
+        }
+
+        $instruction .= $systemHelper
+            ->getPermissionCommands([$folders, ''], explode('-', $permission), false, null, $changeOwner) . "<br>";
+
+        $instructionSU .= $systemHelper
+            ->getPermissionCommands([$folders, ''], explode('-', $permission), true, null, $changeOwner) . "<br>";
+
         if ($changeOwner) {
             $changeOwner = false;
         }
     }
+
     $result['errorMsg'] = $langs['messages']['Permission denied to'] . ':<br><pre>'.implode('<br>', $urls).'</pre>';
-    $result['errorFixInstruction'] = str_replace( '"{C}"' , $instruction, $langs['messages']['permissionInstruction']) . "<br>" .
-                                        str_replace( '{CSU}' , $instructionSU, $langs['messages']['operationNotPermitted']);
+
+    $result['errorFixInstruction'] =
+        str_replace( '"{C}"' , $instruction, $langs['messages']['permissionInstruction']) .
+        "<br>" . str_replace( '{CSU}' , $instructionSU, $langs['messages']['operationNotPermitted']);
 }
 
 ob_clean();
diff --git a/install/core/actions/main.php b/install/core/actions/main.php
index 2879f3a31a..32e3ac81ba 100644
--- a/install/core/actions/main.php
+++ b/install/core/actions/main.php
@@ -29,11 +29,14 @@
 
 $config = $installer->getConfig();
 
-$fields = array(
-    'user-lang' => array(
+$fields = [
+    'user-lang' => [
         'default' => $config->get('language', 'en_US'),
-    ),
-);
+    ],
+    'theme' => [
+        'default' => $config->get('theme'),
+    ],
+];
 
 foreach ($fields as $fieldName => $field) {
     if (isset($_SESSION['install'][$fieldName])) {
@@ -43,4 +46,13 @@ foreach ($fields as $fieldName => $field) {
     }
 }
 
+$language = $installer->createLanguage($_SESSION['install']['user-lang'] ?? 'en_US');
+
+$themes = [];
+foreach ($installer->getThemeList() as $item) {
+    $themes[$item] = $language->translate($item, 'themes', 'Global');
+}
+
+$smarty->assign('themeLabel', $language->translate('theme', 'fields', 'Settings'));
 $smarty->assign('fields', $fields);
+$smarty->assign("themes", $themes);
\ No newline at end of file
diff --git a/install/core/actions/saveSettings.php b/install/core/actions/saveSettings.php
index 211eb08df5..0648970e5b 100644
--- a/install/core/actions/saveSettings.php
+++ b/install/core/actions/saveSettings.php
@@ -28,19 +28,26 @@
  ************************************************************************/
 
 ob_start();
-$result = array('success' => true, 'errorMsg' => '');
+
+$result = [
+    'success' => true,
+    'errorMsg' => '',
+];
 
 // save settings
-$database = array(
+$database = [
     'driver' => 'pdo_mysql',
     'dbname' => $_SESSION['install']['db-name'],
     'user' => $_SESSION['install']['db-user-name'],
     'password' => $_SESSION['install']['db-user-password'],
-);
+];
+
 $host = $_SESSION['install']['host-name'];
+
 if (strpos($host,':') === false) {
-        $host .= ":";
+    $host .= ":";
 }
+
 list($database['host'], $database['port']) = explode(':', $host);
 
 $saveData = [
@@ -49,6 +56,10 @@ $saveData = [
     'siteUrl' => !empty($_SESSION['install']['site-url']) ? $_SESSION['install']['site-url'] : null,
 ];
 
+if (!empty($_SESSION['install']['theme'])) {
+    $saveData['theme'] = $_SESSION['install']['theme'];
+}
+
 if (!empty($_SESSION['install']['default-permissions-user']) && !empty($_SESSION['install']['default-permissions-group'])) {
     $saveData['defaultPermissions'] = [
         'user' => $_SESSION['install']['default-permissions-user'],
diff --git a/install/core/tpl/index.tpl b/install/core/tpl/index.tpl
index e74f495e9c..7ee6113b2c 100644
--- a/install/core/tpl/index.tpl
+++ b/install/core/tpl/index.tpl
@@ -15,7 +15,7 @@
         {/if}
 
         <script type="text/javascript" src="js/install.js"></script>
-        <link href="../client/css/espo/hazyblue.css" rel="stylesheet">
+        <link href="../{$stylesheet}" rel="stylesheet">
         <link href="css/install.css" rel="stylesheet">
         <link rel="shortcut icon" href="../client/img/favicon.ico" type="image/x-icon">
     </head>
diff --git a/install/core/tpl/main.tpl b/install/core/tpl/main.tpl
index 24edc85238..422e069be5 100644
--- a/install/core/tpl/main.tpl
+++ b/install/core/tpl/main.tpl
@@ -1,6 +1,7 @@
 <form id="nav">
     <div class="panel-body">
         <div id="msg-box" class="alert hide"></div>
+
         <div class="row">
             <div class="col-md-12">
                 <div align="center">
@@ -11,29 +12,53 @@
                 </div>
             </div>
         </div>
-        <div class="cell cell-website pull-left" align="left">
-            <label class="field-label-website control-label">{$langs['fields']['Choose your language']}</label>
-            <div class="field field-website">
-                <select name="user-lang" class="form-control">
-                    {foreach from=$languageList item=lbl key=val}
-                        {if $val == $fields['user-lang'].value}
-                            <option selected="selected" value="{$val}">{$lbl}</option>
-                        {else}
-                            <option value="{$val}">{$lbl}</option>
-                        {/if}
-                    {/foreach}
-                </select>
+
+        <div class="row margin-top">
+            <div class="cell cell-language col-md-4">
+                <label class="field-label-language control-label">{$langs['fields']['Choose your language']}</label>
+                <div class="field field-language">
+                    <select name="user-lang" class="form-control">
+                        {foreach from=$languageList item=lbl key=val}
+                            {if $val == $fields['user-lang'].value}
+                                <option selected="selected" value="{$val}">{$lbl}</option>
+                            {else}
+                                <option value="{$val}">{$lbl}</option>
+                            {/if}
+                        {/foreach}
+                    </select>
+                </div>
+            </div>
+
+            <div class="cell cell-theme col-md-4">
+                <label class="field-label-theme control-label">{$themeLabel}</label>
+                <div class="field field-language">
+                    <select name="theme" class="form-control">
+                        {foreach from=$themes item=lbl key=val}
+                            {if $val == $fields['theme'].value}
+                                <option selected="selected" value="{$val}">{$lbl}</option>
+                            {else}
+                                <option value="{$val}">{$lbl}</option>
+                            {/if}
+                        {/foreach}
+                    </select>
+                </div>
+            </div>
+
+            <div class="cell cell-website col-md-4" align="right" style="padding-top: 24px;">
+                <a
+                    target="_blank"
+                    href="https://www.espocrm.com/documentation/administration/installation/"
+                    style="font-weight: 600;"
+                >{$langs['labels']['Installation Guide']}</a>
             </div>
         </div>
-        <div class="cell cell-website pull-right" align="right">
-            <a target="_blank" href="https://www.espocrm.com/documentation/administration/installation/" style="font-weight:600;">{$langs['labels']['Installation Guide']}</a>
-        </div>
-
     </div>
+
     <footer class="modal-footer">
         <button class="btn btn-primary btn-s-wide" type="button" id="start">{$langs['labels']['Start']}</button>
     </footer>
 </form>
+
 <script>
     {literal}
     $(function(){
diff --git a/install/core/tpl/step1.tpl b/install/core/tpl/step1.tpl
index 67c9c5769a..b6cc74c0b2 100644
--- a/install/core/tpl/step1.tpl
+++ b/install/core/tpl/step1.tpl
@@ -6,7 +6,7 @@
                 <div class="row">
                     <div class="cell cell-website col-sm-12 form-group">
                         <div class="field field-website">
-                            <textarea rows="16" class="license-field">{$license}</textarea>
+                            <textarea rows="16" class="license-field form-control">{$license}</textarea>
                         </div>
                     </div>
                 </div>
diff --git a/install/entry.php b/install/entry.php
index c76b04271d..a4d374b2b2 100644
--- a/install/entry.php
+++ b/install/entry.php
@@ -62,6 +62,7 @@ $ignoredFields = [
     'dbDriver',
 ];
 
+
 if (!empty($allPostData)) {
     foreach ($allPostData as $key => $val) {
         if (!in_array($key, $ignoredFields)) {
@@ -152,8 +153,7 @@ $smarty->assign("langsJs", json_encode($langs));
 // include actions and set tpl name
 switch ($action) {
     case 'main':
-        $languageList = $installer->getLanguageList();
-        $smarty->assign("languageList", $languageList);
+        $smarty->assign("languageList", $installer->getLanguageList());
 
         break;
 
@@ -193,6 +193,11 @@ $smarty->assign('action', ucfirst($action));
 $smarty->assign('config', $config);
 $smarty->assign('installerConfig', $installer->getInstallerConfigData());
 
+$theme = $_SESSION['install']['theme'] ?? 'HazyblueVertical';
+$stylesheet = $installer->getMetadata()->get(['themes', $theme, 'stylesheet']);
+
+$smarty->assign('stylesheet', $stylesheet);
+
 if (Utils::checkActionExists($action)) {
     include $actionFile;
 }
@@ -211,3 +216,4 @@ if (!empty($actionFile) && file_exists('install/core/tpl/' . $tplName)) {
 
     $smarty->display('index.tpl');
 }
+
diff --git a/public/install/css/install.css b/public/install/css/install.css
index c1bd3d8b5d..fb5eaf9ede 100644
--- a/public/install/css/install.css
+++ b/public/install/css/install.css
@@ -1,4 +1,9 @@
 
+
+body > .content {
+    padding-left: 0 !important;
+}
+
 .license-field {
 	width: 100%;
 }
@@ -7,10 +12,6 @@
 	cursor: pointer;
 }
 
-select[name="user-lang"] {
-	width: 200px;
-}
-
 .subpanel {
 	text-align: left ;
 }
@@ -73,7 +74,10 @@ select[name="user-lang"] {
 
 .cron-help {
 	margin-top: 40px;
-	color: #ad4846;
+	color: var(--state-danger-text);
+    max-width: 800px;
+    margin-left: auto;
+    margin-right: auto;
 }
 
 .cron-help pre {
@@ -84,7 +88,7 @@ select[name="user-lang"] {
 }
 
 .cron-help p {
-	color: #333;
+	color: var(--text-color);
 }
 
 .table {
@@ -127,23 +131,14 @@ span.ok {
 }
 
 .likes {
-	border-left-color: #D7983B;
-	-moz-border-bottom-colors: none;
-    -moz-border-left-colors: #F1AF4E;
-    -moz-border-right-colors: none;
-    -moz-border-top-colors: none;
-    border-color: #eee;
-    border-image: none;
-    border-radius: 3px;
-    border-style: solid;
-    border-width: 1px 1px 1px 5px;
     margin: 20px 0;
     padding: 10px;
     text-align: center;
+    color: var(--state-success-text);
+    font-weight: 600;
 }
 
 .likes p {
-	color: #B56F08;
 	font-size: 15px;
 }
 
diff --git a/public/install/js/install.js b/public/install/js/install.js
index a3b0ed1ba9..080c0633a8 100644
--- a/public/install/js/install.js
+++ b/public/install/js/install.js
@@ -90,11 +90,15 @@ InstallScript.prototype.main = function() {
 	$("#start").click(function(){
 		$(this).attr('disabled', 'disabled');
 		self.goTo(nextAction);
-	})
+	});
 
-	$('[name="user-lang"]').change(function(){
-		self.goTo(self.action);
-	})
+	$('[name="user-lang"]').change(() => {
+		this.goTo(self.action);
+	});
+
+	$('[name="theme"]').change(() => {
+		this.goTo(self.action);
+	});
 }
 
 InstallScript.prototype.step1 = function() {