Added more dark themes

- Added wrappers for snippet dark theme
- Optimized color pallets

src/web/components/uptime.html

@@ -70,7 +70,7 @@
     initUptimeTable();
 
     function reloadUptimeList(){
-        $("#utmrender").html(`<div class="ui segment">
+        $("#utmrender").html(`<div class="ui utmloading segment">
         <div class="ui active inverted dimmer" style="z-index: 2;">
             <div class="ui text loader">Loading</div>
         </div>