Use bootstrap components for up- and downloads

js/src/bootstrap.scss

@@ -0,0 +1,27 @@
+/*!
+ * Bootstrap v5.1.3 (https://getbootstrap.com/)
+ * Copyright 2011-2021 The Bootstrap Authors
+ * Copyright 2011-2021 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+ */
+
+// scss-docs-start import-stack
+// Configuration
+@import "functions";
+@import "variables";
+@import "mixins";
+@import "utilities";
+
+// Layout & components
+@import "root";
+@import "reboot";
+@import "type";
+@import "images";
+@import "containers";
+@import "grid";
+@import "buttons";
+@import "transitions";
+@import "progress";
+@import "close";
+@import "modal";
+@import "spinners";