fix bug with clear history button

Author: josueJURE

index.html

@@ -38,7 +38,7 @@
         <div class="computation-history-parent">
             <h3>history</h3>
             <ul class="computation-history" aria-label="Computation History"></ul>
-            <button class="clear-history-btn" aria-label="Clear History">clear history</button>
+            <button class="clear-history-btn display" aria-label="Clear History">clear history</button>
 
         </div>
 

index.js

@@ -320,6 +320,7 @@ function clearHistoryInLocalStorage() {
 
 function togglesClearHistoryButton(element, btn) {
   const history = getHistoryFromLocalStorage();
-  btn.classList.toggle("display", element.childElementCount > 0);
+  // btn.classList.toggle("display", element.childElementCount > 0);
+  clearHistoryBtn.classList.toggle("display", element.childElementCount > 0);
 }
 // functions creations ends