diff --git a/js/content.js b/js/content.js
new file mode 100644
index 0000000..29b4f8f
--- /dev/null
+++ b/js/content.js
@@ -0,0 +1,38 @@
+if (typeof chrome.app.isInstalled !== 'undefined') {
+    // Observer
+    const observer = new MutationObserver((mutations, observer) => {
+      for (let mutation of mutations) {
+        if (mutation.type === 'childList') {
+          observer.disconnect();
+          doMagic();
+          observe();
+        }
+      }
+    });
+  
+    // Inject buttons
+    const doMagic = () => {
+        const notRemovableElements = Array.from(document.getElementsByClassName("qc-cmp-ui-showing"));
+        notRemovableElements.forEach(element => {
+            element.classList.remove("qc-cmp-ui-showing");
+        });
+        
+        const removableElements = Array.from(document.getElementsByClassName("qc-cmp-ui-container"));
+        removableElements.forEach(element => {
+            element.remove();
+        });
+    };
+  
+    // Observer starts observe when call this function
+    const observe = () => {
+      observer.observe(document.body, {
+        childList: true,
+        subtree: true,
+        //...
+      });
+    };
+  
+    // Then...
+    doMagic();
+    observe();
+  }
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