Update index.html

Aside

Author: Gmac4247

index.html

@@ -2969,7 +2969,7 @@ <h3 style="margin:7px">Volume of a Sphere</h3>
 </div>
 </section>
 <br><br><br>
-<section style="border: 2px solid red; 
+<aside style="border: 2px solid red; 
             padding: 10px" id="sphere-surface">
 <p style="margin:6px">Advertisement</p>
 <br><br>
@@ -2990,7 +2990,7 @@ <h3 style="margin:7px">Surface Area of a Sphere</h3>
 <p style="margin:6px">( + tax, if applicable )</p>
 <br>
 <a style="margin:12px" class="rounded-button" href="privacy-policy">Contact</a>
-</section>
+</aside>
 <br><br><br><br>
 <section id="cone">
 <h3 style="margin:7px">Volume of a Cone</h3>