fix(core): update

ts/dees-element.classes.cssmanager.ts

@@ -1,5 +1,6 @@
 import { CSSResult } from 'lit-element';
 import * as plugins from './dees-element.plugins';
+import * as domtools from 
 
 export interface IDbVarTriplet {
   cssVarName: string;
@@ -21,7 +22,9 @@ export class CssManager {
         darkValue: darkValueArg
       }
       this.dbVarTripletStore.push(newTriplet)
-      document.body.style.setProperty(newTriplet.cssVarName, newTriplet.darkValue);
+      document.onreadystatechange = () => {
+        document.body.style.setProperty(newTriplet.cssVarName, newTriplet.darkValue);
+      }
       return plugins.litElement.unsafeCSS(newTriplet.cssVarName);
     }
   }