Update index.html

Styling

Author: Gmac4247

index.html

@@ -1790,7 +1790,7 @@ <h3 itemprop="name" style="margin:7px">Calculate the Area of a regular Polygon</
 </math>
 </div>
 <br>
-<div itemprop="usageInfo">
+<div style="margin:12px" itemprop="usageInfo">
 <math xmlns="http://www.w3.org/1998/Math/MathML">
 <mrow>
  <mi>n</mi>