diff --git a/ts/dees-element.classes.cssmanager.ts b/ts/dees-element.classes.cssmanager.ts
index 90b1ca6..78ce5e5 100644
--- a/ts/dees-element.classes.cssmanager.ts
+++ b/ts/dees-element.classes.cssmanager.ts
@@ -1,6 +1,6 @@
 import { CSSResult } from 'lit-element';
 import * as plugins from './dees-element.plugins';
-import * as domtools from 
+import * as domtools from '@designestate/dees-domtools';
 
 export interface IDbVarTriplet {
   cssVarName: string;
@@ -23,7 +23,7 @@ export class CssManager {
       }
       this.dbVarTripletStore.push(newTriplet)
       document.onreadystatechange = () => {
-        document.body.style.setProperty(newTriplet.cssVarName, newTriplet.darkValue);
+        document.body?.style?.setProperty(newTriplet.cssVarName, newTriplet.darkValue);
       }
       return plugins.litElement.unsafeCSS(newTriplet.cssVarName);
     }