diff --git a/Basic Calculator/Updateindex.html b/Basic Calculator/Updateindex.html
index 8f03a3205..b55deafd8 100644
--- a/Basic Calculator/Updateindex.html	
+++ b/Basic Calculator/Updateindex.html	
@@ -1,78 +1,76 @@
 <!DOCTYPE html>
 <html>
 <head>
-	<title>Basic Calculator</title>
-	<link rel="stylesheetmain" type="text/css" href="Cal.css">
+    <title>Basic Calculator</title>
+    <link rel="stylesheet" type="text/css" href="Cal.css"> <!-- Corrected rel attribute -->
 </head>
 <body>
-   <div id="calculator">
-       <h1>Calculator</h1>
-       <div id="display-container">
-            <p id="display">
-            </p>
-       </div>
-       <div id="buttons-container">
-       <div class="button" id="button-clear" data-value="ac">
-           <span>AC</span>
-       </div>
-       <div class="button" id="button-sign" data-value="sign">
-           <span>+/-</span>
-       </div>
-       <div class="button" id="button-percent" data-value="%">
-        <span>%</span>
-       </div>
-        <div class="button red" id="button-divide" data-value="/">
-            <span>/</span>
-        </div>
-        <div class="button" id="button-seven" data-value="7">
-            <span>7</span>
-        </div>
-        <div class="button" id="button-eight" data-value="8">
-            <span>8</span>
-        </div>
-        <div class="button " id="button-nine" data-value="9">
-            <span>9</span>
-        </div>
-        <div class="button red" id="button-multiply" data-value="*">
-            <span>*</span>
-        </div>
-        <div class="button" id="button-four" data-value="4">
-            <span>4</span>
-        </div>
-        <div class="button" id="button-five" data-value="5">
-            <span>5</span>
-        </div>
-        <div class="button " id="button-six" data-value="6">
-            <span>6</span>
-        </div>
-        <div class="button red" id="button-minus" data-value="-">
-            <span>-</span>
-        </div>
-        <div class="button" id="button-one" data-value="1">
-            <span>1</span>
-        </div>
-        <div class="button" id="button-two" data-value="2">
-            <span>2</span>
-        </div>
-        <div class="button " id="button-three" data-value="3">
-            <span>3</span>
-        </div>
-        <div class="button red" id="button-plus" data-value="+">
-            <span>+</span>
-        </div>
-        <div class="button" id="button-zero" data-value="zero">
-            <span>0</span>
-        </div>
-        <div class="button " id="button-decimal" data-value="decimal">
-            <span>.</span>
-        </div>
-        <div class="button red" id="button-equals" data-value="=">
-            <span>=</span>
-        </div>
-        </div>
-   </div> 
+    <div id="calculator">
+        <h1>Calculator</h1>
+        <div id="display-container">
+            <p id="display">0</p> <!-- Added placeholder value -->
+        </div>
+        <div id="buttons-container">
+            <div class="button" id="button-clear" data-value="ac">
+                <span>AC</span>
+            </div>
+            <div class="button" id="button-sign" data-value="sign">
+                <span>+/-</span>
+            </div>
+            <div class="button" id="button-percent" data-value="%">
+                <span>%</span>
+            </div>
+            <div class="button red" id="button-divide" data-value="/">
+                <span>/</span>
+            </div>
+            <div class="button" id="button-seven" data-value="7">
+                <span>7</span>
+            </div>
+            <div class="button" id="button-eight" data-value="8">
+                <span>8</span>
+            </div>
+            <div class="button" id="button-nine" data-value="9">
+                <span>9</span>
+            </div>
+            <div class="button red" id="button-multiply" data-value="*">
+                <span>*</span>
+            </div>
+            <div class="button" id="button-four" data-value="4">
+                <span>4</span>
+            </div>
+            <div class="button" id="button-five" data-value="5">
+                <span>5</span>
+            </div>
+            <div class="button" id="button-six" data-value="6">
+                <span>6</span>
+            </div>
+            <div class="button red" id="button-minus" data-value="-">
+                <span>-</span>
+            </div>
+            <div class="button" id="button-one" data-value="1">
+                <span>1</span>
+            </div>
+            <div class="button" id="button-two" data-value="2">
+                <span>2</span>
+            </div>
+            <div class="button" id="button-three" data-value="3">
+                <span>3</span>
+            </div>
+            <div class="button red" id="button-plus" data-value="+">
+                <span>+</span>
+            </div>
+            <div class="button" id="button-zero" data-value="0"> <!-- Changed data-value to "0" -->
+                <span>0</span>
+            </div>
+            <div class="button" id="button-decimal" data-value=".">
+                <span>.</span>
+            </div>
+            <div class="button red" id="button-equals" data-value="=">
+                <span>=</span>
+            </div>
+        </div>
+    </div> 
 
-<script type="text/javascript" src="Call.js ">
-</script>
+    <script type="text/javascript" src="Call.js"></script> <!-- Removed extra space -->
 </body>
 </html>
