diff --git a/demo/src/custom-cards/card-modder.js b/demo/src/custom-cards/card-modder.js
index 26e56d22d5..82f0411115 100644
--- a/demo/src/custom-cards/card-modder.js
+++ b/demo/src/custom-cards/card-modder.js
@@ -53,6 +53,7 @@ class CardModder extends LitElement {
     for (var k in this._config.style) {
       if (window.cardTools.hasTemplate(this._config.style[k]))
         this.templated.push(k);
+      this.card.style.setProperty(k, '');
       target.style.setProperty(
         k,
         window.cardTools.parseTemplate(this._config.style[k])