diff --git a/classes/pref/prefs.php b/classes/pref/prefs.php
index 1988649a5..bf4d6e42e 100644
--- a/classes/pref/prefs.php
+++ b/classes/pref/prefs.php
@@ -565,7 +565,7 @@ class Pref_Prefs extends Handler_Protected {
 
 			} else if ($pref_name == "USER_CSS_THEME") {
 
-				$themes = array_merge(glob("themes/*.css"), glob("themes.local/*.css"));
+				$themes = array_merge(glob("themes/*.php"), glob("themes/*.css"), glob("themes.local/*.css"));
 				$themes = array_map("basename", $themes);
 				$themes = array_filter($themes, "theme_valid");
 				asort($themes);
diff --git a/include/functions2.php b/include/functions2.php
index 04e3c5140..d06a7a710 100644
--- a/include/functions2.php
+++ b/include/functions2.php
@@ -2428,7 +2428,7 @@
 	}
 
 	function theme_valid($theme) {
-		if ($theme == "default.css" || $theme == "night.css") return true; // needed for array_filter
+		if ($theme == "default.php" || $theme == "night.css") return true; // needed for array_filter
 		$file = "themes/" . basename($theme);
 
 		if (!file_exists($file)) $file = "themes.local/" . basename($theme);
diff --git a/index.php b/index.php
index 66314ad17..6e81bd619 100644
--- a/index.php
+++ b/index.php
@@ -68,7 +68,7 @@
 		if ($theme && theme_valid("$theme")) {
 			echo stylesheet_tag(get_theme_path($theme));
 		} else {
-			echo stylesheet_tag("themes/default.css");
+			echo stylesheet_tag("themes/default.php");
 		}
 	}
 	?>
diff --git a/prefs.php b/prefs.php
index 4298c38a2..b1cdb0b49 100644
--- a/prefs.php
+++ b/prefs.php
@@ -44,7 +44,7 @@
 		if ($theme && theme_valid("$theme")) {
 			echo stylesheet_tag(get_theme_path($theme));
 		} else {
-			echo stylesheet_tag("themes/default.css");
+			echo stylesheet_tag("themes/default.php");
 		}
 	}
 	?>
diff --git a/themes/default.php b/themes/default.php
new file mode 100644
index 000000000..db131e34c
--- /dev/null
+++ b/themes/default.php
@@ -0,0 +1,14 @@
+<?php
+	header("Content-type: text/css");
+
+	function import_tag($filename) {
+		return "@import \"$filename?".filemtime($filename)."\";";
+	}
+
+	$styles = [ "tt-rss.css", "dijit.css", "cdm.css", "prefs.css" ];
+
+	foreach ($styles as $style) {
+		print import_tag("../css/$style") . "\n";
+	}
+?>
+
diff --git a/themes/night.css b/themes/night.css
index 7f381b9c1..9d4cbb392 100644
--- a/themes/night.css
+++ b/themes/night.css
@@ -1,4 +1,4 @@
-@import "default.css";
+@import "default.php";
 
 body#ttrssMain #feeds-holder {
 	background : #222;
@@ -19,7 +19,7 @@ body#ttrssMain #content-insert {
 }
 
 body#ttrssMain #feedTree .dijitTreeRow {
-	color : #ccc;
+	color : #ccc ! important;
 }
 
 body#ttrssMain.claro .dijitTree .dijitTreeRowHover {
@@ -29,7 +29,7 @@ body#ttrssMain.claro .dijitTree .dijitTreeRowHover {
 
 body#ttrssMain.claro .dijitTree .dijitTreeRowSelected {
 	background : #555;
-	border-color : #666;
+	border-color : #666 ! important;
 }
 
 body#ttrssMain.claro .dijitTreeRowSelected .dijitTreeLabel {