Various style fixes (#13534)

* Various style fixes

- Fix the rest of the monochrome borders for arc-green
- Fix close icon position on system notice modal and padding
- Fix selectable table color for arc-green

* proper fix for close icon

Co-authored-by: Lauris BH <lauris@nix.lv>

templates/admin/notice.tmpl

@@ -74,7 +74,7 @@
 </div>
 
 <div class="ui modal admin" id="detail-modal">
-	<i class="close icon"></i>
+	<i class="close icon inside"></i>
 	<div class="header">{{$.i18n.Tr "admin.notices.view_detail_header"}}</div>
 	<div class="content">
 		<div class="sub header"></div>