Update index.html

HTML structure

Author: Gmac4247

index.html

@@ -1102,11 +1102,13 @@ <h3 style="margin:7px">Area of a square</h3>
 	<mi>side</mi>
 	</mrow>
 	<mo>=</mo>
-      <msup>
+      <mrow>
+		  <msup>
         <mi>side</mi>
         <mn>2</mn>
       </msup>
-</mrow>
+	  </mrow>
+	  </mrow>
     </math>
 </section>
 <br>
@@ -1138,15 +1140,18 @@ <h3 style="margin:7px">Volume of a cube</h3>
 		 <mi>edge</mi>
 	 </mrow>
 	 <mo>=</mo>
-      <msup>
+    <mrow>
+		<msup>
         <mi>edge</mi>
         <mn>3</mn>
       </msup>
-</mrow>
+	</mrow>
+	</mrow>
     </math>
 </section>
 </section>
 </details>
+</section>
 </details>
 </section>
 <br>
@@ -2624,7 +2629,6 @@ <h3 style="margin:7px">
 </math>
 <br>
 <br>
-<div>
 <label style="margin:12px" for="circle-radius-a">Radius:</label>
 <input id="circle-radius-a" type="number" value="1" step="any">
 <script>
@@ -3493,7 +3497,7 @@ <h3 style="margin:7px">The volume of a sphere is defined by comparing it to a cu
 <br>
 <br>
 <br>
-<section id="sphere_surface" style="border: 2px solid red; 
+<section style="border: 2px solid red; 
             padding: 10px" id="sphere-surface">
   <p style="margin:6px">Advertisement</p>
 <br>
@@ -3598,12 +3602,10 @@ <h3 style="margin:7px">Volume of a spherical cap</h3>
 <p style="margin:12px" id="cap-volume"></p>
 </div>
 </section>
-</div>
 <br>
 <br>
 <br>
 <br>
-<div>
 <section id="cone">
 <h3 style="margin:7px">Volume of a cone</h3>
 <br>
@@ -4946,8 +4948,6 @@ <h3 style="margin:7px">Volume of a tetrahedron</h3>
 </div>
 </section>
 </section>
-</div>
-</section>
 </section>
 </article>
 <br>