Update index.html

public/index.html

@@ -61,7 +61,7 @@
         <br>
         The color of the background can be changed in the attribute skyColor. Currently it is red. 
         The color is defined using <a href="http://en.wikipedia.org/wiki/RGB_color_model" target="_blank"> RGB color model </a>
-        with arithmetic notation (0.0 t0 1.0 per value). <br>
+        with arithmetic notation (0.0 to 1.0 per value). <br>
 
         The color of the Box can be changed by applying an appearance to the shape node. 
         In X3D, the <a href="http://www.web3d.org/files/specifications/19775-1/V3.3/index.html" target="_blank"> Shape node </a> associates a geometry node with