diff --git a/libraries/classes/Theme.php b/libraries/classes/Theme.php
index 7eb5dbf7279f..ec9073772059 100644
--- a/libraries/classes/Theme.php
+++ b/libraries/classes/Theme.php
@@ -217,17 +217,6 @@ public function getPath()
         return $this->path;
     }
 
-    /**
-     * returns layout file
-     *
-     * @access public
-     * @return string layout file
-     */
-    public function getLayoutFile()
-    {
-        return $this->getPath() . '/layout.inc.php';
-    }
-
     /**
      * set path to theme
      *
@@ -416,38 +405,4 @@ public function getPrintPreview()
             'screen' => $screen,
         ]);
     }
-
-    /**
-     * Generates code for CSS gradient using various browser extensions.
-     *
-     * @param string $start_color Color of gradient start, hex value without #
-     * @param string $end_color   Color of gradient end, hex value without #
-     *
-     * @return string CSS code.
-     */
-    public function getCssGradient($start_color, $end_color)
-    {
-        $result = [];
-        // Opera 9.5+, IE 9
-        $result[] = 'background-image: url(./themes/svg_gradient.php?from='
-            . $start_color . '&to=' . $end_color . ');';
-        $result[] = 'background-size: 100% 100%;';
-        // Safari 4-5, Chrome 1-9
-        $result[] = 'background: '
-            . '-webkit-gradient(linear, left top, left bottom, from(#'
-            . $start_color . '), to(#' . $end_color . '));';
-        // Safari 5.1, Chrome 10+
-        $result[] = 'background: -webkit-linear-gradient(top, #'
-            . $start_color . ', #' . $end_color . ');';
-        // Firefox 3.6+
-        $result[] = 'background: -moz-linear-gradient(top, #'
-            . $start_color . ', #' . $end_color . ');';
-        // IE 10
-        $result[] = 'background: -ms-linear-gradient(top, #'
-            . $start_color . ', #' . $end_color . ');';
-        // Opera 11.10
-        $result[] = 'background: -o-linear-gradient(top, #'
-            . $start_color . ', #' . $end_color . ');';
-        return implode("\n", $result);
-    }
 }
diff --git a/libraries/classes/ThemeManager.php b/libraries/classes/ThemeManager.php
index 89ee24d2b00c..c3da79a774e7 100644
--- a/libraries/classes/ThemeManager.php
+++ b/libraries/classes/ThemeManager.php
@@ -446,12 +446,5 @@ public static function initializeTheme()
          * @global string $GLOBALS['pmaThemeImage']
          */
         $GLOBALS['pmaThemeImage']   = $GLOBALS['PMA_Theme']->getImgPath();
-
-        /**
-         * load layout file if exists
-         */
-        if (@file_exists($GLOBALS['PMA_Theme']->getLayoutFile())) {
-            include $GLOBALS['PMA_Theme']->getLayoutFile();
-        }
     }
 }
diff --git a/test/classes/ThemeTest.php b/test/classes/ThemeTest.php
index 6c47e0094dcd..9a91ef8e767d 100644
--- a/test/classes/ThemeTest.php
+++ b/test/classes/ThemeTest.php
@@ -44,7 +44,6 @@ protected function setUp()
         $GLOBALS['PMA_Config'] = new Config();
         $GLOBALS['PMA_Config']->enableBc();
         $GLOBALS['text_dir'] = 'ltr';
-        include 'themes/pmahomme/layout.inc.php';
         $GLOBALS['server'] = '99';
     }
 
@@ -209,16 +208,6 @@ public function testGetSetPath()
         $this->assertEquals('./themes/original', $this->object->getPath());
     }
 
-    /**
-     * Test for Theme::loadInfo
-     *
-     * @return void
-     */
-    public function testGetLayoutFile()
-    {
-        $this->assertContains('layout.inc.php', $this->object->getLayoutFile());
-    }
-
     /**
      * Test for Theme::checkVersion
      *
@@ -304,26 +293,6 @@ public function testGetPrintPreview()
         );
     }
 
-    /**
-     * Test for getCssGradient
-     *
-     * @return void
-     */
-    public function testgetCssGradient()
-    {
-        $this->assertEquals(
-            $this->object->getCssGradient('12345', '54321'),
-            'background-image: url(./themes/svg_gradient.php?from=12345&to=54321);'
-            . "\n" . 'background-size: 100% 100%;'
-            . "\n" . 'background: -webkit-gradient(linear, left top, left bottom, '
-            . 'from(#12345), to(#54321));'
-            . "\n" . 'background: -webkit-linear-gradient(top, #12345, #54321);'
-            . "\n" . 'background: -moz-linear-gradient(top, #12345, #54321);'
-            . "\n" . 'background: -ms-linear-gradient(top, #12345, #54321);'
-            . "\n" . 'background: -o-linear-gradient(top, #12345, #54321);'
-        );
-    }
-
     /**
      * Test for getImgPath
      *
diff --git a/themes/.gitignore b/themes/.gitignore
index 4f6acac5acfd..694eb9f21d1c 100644
--- a/themes/.gitignore
+++ b/themes/.gitignore
@@ -1,7 +1,6 @@
 /*
 !/.gitignore
 !/dot.gif
-!/svg_gradient.php
 !/original/
 !/pmahomme/
 !/metro/
diff --git a/themes/metro/layout.inc.php b/themes/metro/layout.inc.php
deleted file mode 100644
index 9da4cc164f84..000000000000
--- a/themes/metro/layout.inc.php
+++ /dev/null
@@ -1,169 +0,0 @@
-<?php
-/* vim: set expandtab sw=4 ts=4 sts=4: */
-/**
- * configures general layout
- * for detailed layout configuration please refer to the css files
- *
- * @package PhpMyAdmin-theme
- */
-declare(strict_types=1);
-
-$GLOBALS['cfg']['NaviWidth']                = '250';
-$GLOBALS['cfg']['FontFamily']               = '"Open Sans", "Segoe UI"';
-$GLOBALS['cfg']['FontFamilyLight']          = '"Open Sans Light", "Segoe UI Light", "Segoe UI"; font-weight: 300';
-$GLOBALS['cfg']['FontFamilyFixed']          = 'Consolas, Monospace, "Lucida Grande"';
-
-/* Theme color scheme
- * Values: "teal", "redmond", "blueeyes", "mono", "win"
- * Set this value for the desired color scheme
- */
-
-$scheme                                     = "win";
-$GLOBALS['cfg']['Scheme']                   = $scheme;
-
-switch ($scheme) {
-    case "win":
-        $GLOBALS['cfg']['NaviColor']                = '#EEEEEE';
-        $GLOBALS['cfg']['NaviBackground']           = '#377796';
-        $GLOBALS['cfg']['NaviBackgroundLight']      = '#428EB4';
-        $GLOBALS['cfg']['NaviPointerColor']         = '#333333';
-        $GLOBALS['cfg']['NaviPointerBackground']    = '#377796';
-        $GLOBALS['cfg']['NaviDatabaseNameColor']    = '#333333';
-        $GLOBALS['cfg']['NaviHoverBackground']      = '#428EB4';
-        $GLOBALS['cfg']['MainColor']                = '#444444';
-        $GLOBALS['cfg']['MainBackground']           = '#FFFFFF';
-        $GLOBALS['cfg']['BrowsePointerColor']       = '#377796';
-        $GLOBALS['cfg']['BrowseMarkerColor']        = '#000000';
-        $GLOBALS['cfg']['BrowseWarningColor']       = '#D44A26';
-        $GLOBALS['cfg']['BrowseSuccessColor']       = '#01A31C';
-        $GLOBALS['cfg']['BrowseGrayColor']          = '#CCCCCC';
-        $GLOBALS['cfg']['BrowseMarkerBackground']   = '#EEEEEE';
-        $GLOBALS['cfg']['BorderColor']              = '#DDDDDD';
-        $GLOBALS['cfg']['ButtonColor']              = '#FFFFFF';
-        $GLOBALS['cfg']['ButtonBackground']         = '#377796';
-        $GLOBALS['cfg']['ButtonHover']              = '#428EB4';
-        $GLOBALS['cfg']['ThBackground']             = '#F7F7F7';
-        $GLOBALS['cfg']['ThDisabledBackground']     = '#F3F3F3';
-        $GLOBALS['cfg']['ThColor']                  = '#666666';
-        $GLOBALS['cfg']['ThPointerColor']           = '#000000';
-        $GLOBALS['cfg']['BgOne']                    = '#F7F7F7';
-        $GLOBALS['cfg']['BgTwo']                    = '#FFFFFF';
-        $GLOBALS['cfg']['BlueHeader']               = '#3A7EAD';
-        break;
-
-    case "teal":
-        $GLOBALS['cfg']['NaviColor']                = '#FFFFFF';
-        $GLOBALS['cfg']['NaviBackground']           = '#004D60';
-        $GLOBALS['cfg']['NaviBackgroundLight']      = '#04627C';
-        $GLOBALS['cfg']['NaviPointerColor']         = '#666666';
-        $GLOBALS['cfg']['NaviPointerBackground']    = '#004D60';
-        $GLOBALS['cfg']['NaviDatabaseNameColor']    = '#FFFFFF';
-        $GLOBALS['cfg']['NaviHoverBackground']      = '#216475';
-        $GLOBALS['cfg']['MainColor']                = '#444444';
-        $GLOBALS['cfg']['MainBackground']           = '#FFFFFF';
-        $GLOBALS['cfg']['BrowsePointerColor']       = '#004d60';
-        $GLOBALS['cfg']['BrowseMarkerColor']        = '#000000';
-        $GLOBALS['cfg']['BrowseWarningColor']       = '#D44A26';
-        $GLOBALS['cfg']['BrowseSuccessColor']       = '#01A31C';
-        $GLOBALS['cfg']['BrowseGrayColor']          = '#CCCCCC';
-        $GLOBALS['cfg']['BrowseMarkerBackground']   = '#EEEEEE';
-        $GLOBALS['cfg']['BorderColor']              = '#DDDDDD';
-        $GLOBALS['cfg']['ButtonColor']              = '#FFFFFF';
-        $GLOBALS['cfg']['ButtonBackground']         = '#AAAAAA';
-        $GLOBALS['cfg']['ButtonHover']              = '#000000';
-        $GLOBALS['cfg']['ThBackground']             = '#F7F7F7';
-        $GLOBALS['cfg']['ThDisabledBackground']     = '#F3F3F3';
-        $GLOBALS['cfg']['ThColor']                  = '#666666';
-        $GLOBALS['cfg']['ThPointerColor']           = '#000000';
-        $GLOBALS['cfg']['BgOne']                    = '#F7F7F7';
-        $GLOBALS['cfg']['BgTwo']                    = '#FFFFFF';
-        $GLOBALS['cfg']['BlueHeader']               = '#3A7EAD';
-        break;
-
-    case "redmond":
-        $GLOBALS['cfg']['NaviColor']                = '#FFFFFF';
-        $GLOBALS['cfg']['NaviBackground']           = '#780505';
-        $GLOBALS['cfg']['NaviBackgroundLight']      = '#A10707';
-        $GLOBALS['cfg']['NaviPointerColor']         = '#666666';
-        $GLOBALS['cfg']['NaviPointerBackground']    = '#780505';
-        $GLOBALS['cfg']['NaviDatabaseNameColor']    = '#FFFFFF';
-        $GLOBALS['cfg']['NaviHoverBackground']      = '#A10707';
-        $GLOBALS['cfg']['MainColor']                = '#444444';
-        $GLOBALS['cfg']['MainBackground']           = '#FFFFFF';
-        $GLOBALS['cfg']['BrowsePointerColor']       = '#780505';
-        $GLOBALS['cfg']['BrowseMarkerColor']        = '#000000';
-        $GLOBALS['cfg']['BrowseWarningColor']       = '#D44A26';
-        $GLOBALS['cfg']['BrowseSuccessColor']       = '#01A31C';
-        $GLOBALS['cfg']['BrowseGrayColor']          = '#CCCCCC';
-        $GLOBALS['cfg']['BrowseMarkerBackground']   = '#EEEEEE';
-        $GLOBALS['cfg']['BorderColor']              = '#DDDDDD';
-        $GLOBALS['cfg']['ButtonColor']              = '#FFFFFF';
-        $GLOBALS['cfg']['ButtonBackground']         = '#AAAAAA';
-        $GLOBALS['cfg']['ButtonHover']              = '#000000';
-        $GLOBALS['cfg']['ThBackground']             = '#F7F7F7';
-        $GLOBALS['cfg']['ThDisabledBackground']     = '#F3F3F3';
-        $GLOBALS['cfg']['ThColor']                  = '#666666';
-        $GLOBALS['cfg']['ThPointerColor']           = '#000000';
-        $GLOBALS['cfg']['BgOne']                    = '#F7F7F7';
-        $GLOBALS['cfg']['BgTwo']                    = '#FFFFFF';
-        $GLOBALS['cfg']['BlueHeader']               = '#3A7EAD';
-        break;
-
-    case "blueeyes":
-        $GLOBALS['cfg']['NaviColor']                = '#FFFFFF';
-        $GLOBALS['cfg']['NaviBackground']           = '#377796';
-        $GLOBALS['cfg']['NaviBackgroundLight']      = '#428EB4';
-        $GLOBALS['cfg']['NaviPointerColor']         = '#666666';
-        $GLOBALS['cfg']['NaviPointerBackground']    = '#377796';
-        $GLOBALS['cfg']['NaviDatabaseNameColor']    = '#FFFFFF';
-        $GLOBALS['cfg']['NaviHoverBackground']      = '#428EB4';
-        $GLOBALS['cfg']['MainColor']                = '#444444';
-        $GLOBALS['cfg']['MainBackground']           = '#FFFFFF';
-        $GLOBALS['cfg']['BrowsePointerColor']       = '#377796';
-        $GLOBALS['cfg']['BrowseMarkerColor']        = '#000000';
-        $GLOBALS['cfg']['BrowseWarningColor']       = '#D44A26';
-        $GLOBALS['cfg']['BrowseSuccessColor']       = '#01A31C';
-        $GLOBALS['cfg']['BrowseGrayColor']          = '#CCCCCC';
-        $GLOBALS['cfg']['BrowseMarkerBackground']   = '#EEEEEE';
-        $GLOBALS['cfg']['BorderColor']              = '#DDDDDD';
-        $GLOBALS['cfg']['ButtonColor']              = '#FFFFFF';
-        $GLOBALS['cfg']['ButtonBackground']         = '#377796';
-        $GLOBALS['cfg']['ButtonHover']              = '#000000';
-        $GLOBALS['cfg']['ThBackground']             = '#F7F7F7';
-        $GLOBALS['cfg']['ThDisabledBackground']     = '#F3F3F3';
-        $GLOBALS['cfg']['ThColor']                  = '#666666';
-        $GLOBALS['cfg']['ThPointerColor']           = '#000000';
-        $GLOBALS['cfg']['BgOne']                    = '#F7F7F7';
-        $GLOBALS['cfg']['BgTwo']                    = '#FFFFFF';
-        $GLOBALS['cfg']['BlueHeader']               = '#3A7EAD';
-        break;
-
-    case "mono":
-        $GLOBALS['cfg']['NaviColor']                = '#FFFFFF';
-        $GLOBALS['cfg']['NaviBackground']           = '#666666';
-        $GLOBALS['cfg']['NaviBackgroundLight']      = '#999999';
-        $GLOBALS['cfg']['NaviPointerColor']         = '#666666';
-        $GLOBALS['cfg']['NaviPointerBackground']    = '#666666';
-        $GLOBALS['cfg']['NaviDatabaseNameColor']    = '#FFFFFF';
-        $GLOBALS['cfg']['NaviHoverBackground']      = '#999999';
-        $GLOBALS['cfg']['MainColor']                = '#444444';
-        $GLOBALS['cfg']['MainBackground']           = '#FFFFFF';
-        $GLOBALS['cfg']['BrowsePointerColor']       = '#666666';
-        $GLOBALS['cfg']['BrowseMarkerColor']        = '#000000';
-        $GLOBALS['cfg']['BrowseWarningColor']       = '#666666';
-        $GLOBALS['cfg']['BrowseSuccessColor']       = '#888888';
-        $GLOBALS['cfg']['BrowseGrayColor']          = '#CCCCCC';
-        $GLOBALS['cfg']['BrowseMarkerBackground']   = '#EEEEEE';
-        $GLOBALS['cfg']['BorderColor']              = '#DDDDDD';
-        $GLOBALS['cfg']['ButtonColor']              = '#FFFFFF';
-        $GLOBALS['cfg']['ButtonBackground']         = '#AAAAAA';
-        $GLOBALS['cfg']['ButtonHover']              = '#000000';
-        $GLOBALS['cfg']['ThBackground']             = '#F7F7F7';
-        $GLOBALS['cfg']['ThDisabledBackground']     = '#F3F3F3';
-        $GLOBALS['cfg']['ThColor']                  = '#666666';
-        $GLOBALS['cfg']['ThPointerColor']           = '#000000';
-        $GLOBALS['cfg']['BgOne']                    = '#F7F7F7';
-        $GLOBALS['cfg']['BgTwo']                    = '#FFFFFF';
-        $GLOBALS['cfg']['BlueHeader']               = '#555555';
-        break;
-}
diff --git a/themes/original/layout.inc.php b/themes/original/layout.inc.php
deleted file mode 100644
index fddab7edf7c9..000000000000
--- a/themes/original/layout.inc.php
+++ /dev/null
@@ -1,77 +0,0 @@
-<?php
-/* vim: set expandtab sw=4 ts=4 sts=4: */
-/**
- * configures general layout
- * for detailed layout configuration please refer to the css files
- *
- * @package    PhpMyAdmin-theme
- * @subpackage Original
- */
-declare(strict_types=1);
-
-/**
- * navi frame
- */
-// navi frame width
-$GLOBALS['cfg']['NaviWidth']                = 240;
-
-// foreground (text) color for the navi frame
-$GLOBALS['cfg']['NaviColor']                = '#000000';
-
-// background for the navi frame
-$GLOBALS['cfg']['NaviBackground']           = '#D0DCE0';
-
-// foreground (text) color of the pointer in navi frame
-$GLOBALS['cfg']['NaviPointerColor']         = '#000000';
-// background of the pointer in navi frame
-$GLOBALS['cfg']['NaviPointerBackground']    = '#9999CC';
-
-/**
- * main frame
- */
-// foreground (text) color for the main frame
-$GLOBALS['cfg']['MainColor']                = '#000000';
-
-// background for the main frame
-$GLOBALS['cfg']['MainBackground']           = '#F5F5F5';
-
-// foreground (text) color of the pointer in browse mode
-$GLOBALS['cfg']['BrowsePointerColor']       = '#000000';
-
-// background of the pointer in browse mode
-$GLOBALS['cfg']['BrowsePointerBackground']  = '#CCFFCC';
-
-// foreground (text) color of the marker (visually marks row by clicking on it)
-// in browse mode
-$GLOBALS['cfg']['BrowseMarkerColor']        = '#000000';
-
-// background of the marker (visually marks row by clicking on it) in browse mode
-$GLOBALS['cfg']['BrowseMarkerBackground']   = '#FFCC99';
-
-/**
- * fonts
- */
-/**
- * the font family as a valid css font family value,
- * if not set the browser default will be used
- * (depending on browser, DTD and system settings)
- */
-$GLOBALS['cfg']['FontFamily']           = 'sans-serif';
-/**
- * fixed width font family, used in textarea
- */
-$GLOBALS['cfg']['FontFamilyFixed']      = 'monospace';
-
-/**
- * tables
- */
-// border
-$GLOBALS['cfg']['Border']               = 0;
-// table header and footer color
-$GLOBALS['cfg']['ThBackground']         = '#D3DCE3';
-// table header and footer background
-$GLOBALS['cfg']['ThColor']              = '#000000';
-// table data row background
-$GLOBALS['cfg']['BgOne']                = '#E5E5E5';
-// table data row background, alternate
-$GLOBALS['cfg']['BgTwo']                = '#D5D5D5';
diff --git a/themes/pmahomme/layout.inc.php b/themes/pmahomme/layout.inc.php
deleted file mode 100644
index 5cdaed866d40..000000000000
--- a/themes/pmahomme/layout.inc.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-/* vim: set expandtab sw=4 ts=4 sts=4: */
-/**
- * configures general layout
- * for detailed layout configuration please refer to the css files
- *
- * @package    PhpMyAdmin-theme
- * @subpackage PMAHomme
- */
-declare(strict_types=1);
-
-/**
- * navi frame
- */
-// navi frame width
-$GLOBALS['cfg']['NaviWidth']                = 240;
-
-// foreground (text) color for the navi frame
-$GLOBALS['cfg']['NaviColor']                = '#000';
-
-// background for the navi frame
-$GLOBALS['cfg']['NaviBackground']           = '#f3f3f3';
-
-// foreground (text) color of the pointer in navi frame
-$GLOBALS['cfg']['NaviPointerColor']         = '#000';
-
-// background of the pointer in navi frame
-$GLOBALS['cfg']['NaviPointerBackground']    = '#ddd';
-
-/**
- * main frame
- */
-// foreground (text) color for the main frame
-$GLOBALS['cfg']['MainColor']                = '#444';
-
-// background for the main frame
-$GLOBALS['cfg']['MainBackground']           = '#fff';
-
-// foreground (text) color of the pointer in browse mode
-$GLOBALS['cfg']['BrowsePointerColor']       = '#000';
-
-// background of the pointer in browse mode
-$GLOBALS['cfg']['BrowsePointerBackground']  = '#cfc';
-
-// foreground (text) color of the marker (visually marks row by clicking on it)
-// in browse mode
-$GLOBALS['cfg']['BrowseMarkerColor']        = '#000';
-
-// background of the marker (visually marks row by clicking on it) in browse mode
-$GLOBALS['cfg']['BrowseMarkerBackground']   = '#fc9';
-
-/**
- * fonts
- */
-/**
- * the font family as a valid css font family value,
- * if not set the browser default will be used
- * (depending on browser, DTD and system settings)
- */
-$GLOBALS['cfg']['FontFamily']           = 'sans-serif';
-/**
- * fixed width font family, used in textarea
- */
-$GLOBALS['cfg']['FontFamilyFixed']      = 'monospace';
-
-/**
- * tables
- */
-// border
-$GLOBALS['cfg']['Border']               = 0;
-// table header and footer color
-$GLOBALS['cfg']['ThBackground']         = '#D3DCE3';
-// table header and footer background
-$GLOBALS['cfg']['ThColor']              = '#000';
-// table data row background
-$GLOBALS['cfg']['BgOne']                = '#E5E5E5';
-// table data row background, alternate
-$GLOBALS['cfg']['BgTwo']                = '#D5D5D5';
diff --git a/themes/svg_gradient.php b/themes/svg_gradient.php
deleted file mode 100644
index e4ef33d94656..000000000000
--- a/themes/svg_gradient.php
+++ /dev/null
@@ -1,55 +0,0 @@
-<?php
-/**
- * Theme based generator for SVG gradient.
- *
- * @package PhpMyAdmin-theme
- */
-declare(strict_types=1);
-
-header('Content-Type: image/svg+xml');
-header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 3600) . ' GMT');
-
-/**
- * Gets single color from GET parameters validating it.
- *
- * @param string $get_name Name of parameter in request
- * @param string $default  Default value
- *
- * @return string Color name or code.
- */
-function PMA_gradientGetColor($get_name, $default)
-{
-    // get color from GET args, only alphanumeric characters
-    $opts = ['options' => ['regexp' => '/^[a-z0-9]+$/i']];
-    $color = filter_input(INPUT_GET, $get_name, FILTER_VALIDATE_REGEXP, $opts);
-    if (preg_match('/^[a-f0-9]{6}$/', $color)) {
-        return '#' . $color;
-    }
-    return $color ? $color : $default;
-}
-
-$from = PMA_gradientGetColor('from', 'white');
-$to = PMA_gradientGetColor('to', 'blank');
-
-echo '<?xml version="1.0" ?>';
-?>
-<svg
-    xmlns="http://www.w3.org/2000/svg"
-    preserveAspectRatio="none"
-    version="1.0" width="100%" height="100%">
-    <defs>
-        <linearGradient id="linear-gradient" x1="0%" y1="0%" x2="0%" y2="100%">
-            <stop
-                offset="0%"
-                stop-color="<?php echo $from; ?>"
-                stop-opacity="1"
-            />
-            <stop
-                offset="100%"
-                stop-color="<?php echo $to; ?>"
-                stop-opacity="1"
-            />
-        </linearGradient>
-    </defs>
-    <rect width="100%" height="100%" style="fill:url(#linear-gradient);" />
-</svg>