GUI Button's Hot Spot Wandering in Web Player

I’ve created a GuiButton that works as expected in Stand-Alone deployment, but in Web Player deployment, the button’s hot spot is no where near the actual button. I assumed it was the different dimensions of the web build and tried to sloe with Screen.width*.5, Screen.height*.5 to place the button, but the hot-spot still wanders…

any suggestions?

Thank you!

Update: Looks like the issue is unique to Chrome. Buttons function as expect in FireFox and IE