Cleaned up and reorganized projects CSS.

assets/css/app/darkmode.css

@@ -0,0 +1,32 @@
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2022 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+.darkmode-layer {
+    z-index: 2020;
+}
+
+/** If darkmode is enabled revert the blening for images and videos, as these should be shown not inverted */
+.darkmode--activated img,
+.darkmode--activated video {
+    mix-blend-mode: difference;
+}
+
+.darkmode--activated .hoverpic:hover {
+    background: black;
+}