Update index.html

Fix

Author: Gmac4247

index.html

@@ -115,7 +115,7 @@
 </div>
 <main itemscope itemtype="https://schema.org/LearningResource https://schema.org/MathSolver" id="cgs">
 <meta itemprop="name" content="Core Geometric System ™">
-<meta itemprop="dateModified" content="2026-08-17T08:20:29+02:00">
+<meta itemprop="dateModified" content="2026-08-19T15:59:29+02:00">
 <meta itemprop="accessMode" content="mathOnVisual">
 <meta itemprop="accessibilityHazard" content="none">
 <meta itemprop="accessibilitySummary" content="Equations with figures and explanations">
@@ -4595,6 +4595,7 @@ <h3 itemprop="name" style="margin:12px">Volume of a Frustum Pyramid</h3>
   </math>
 </div>
 </div>
+</div>
 <br>
 <br><br><br>
 <div style="margin:12px" itemprop="result" itemscope itemtype="https://schema.org/PropertyValue">