I want to change the color of the buttons on the slider.

Can you please tell me how ? 

I tried adding some CSS to the Global Styles editor but it does Not work.

.tp-button.site-blue, .tp-button:hover.site-blue, .purchase.site-blue, .purchase:hover.site-blue {  background-color: #336699;  -webkit-box-shadow: 0px 3px 0px 0px #0f3e68;  -moz-box-shadow: 0px 3px 0px 0px #0f3e68;  box-shadow: 0px 3px 0px 0px #0f3e68
}

Then I make reference to the button like so:

<a href='./shop' class='tp-button site-blue big'>Shop Now</a>

Please help

Wait .. Never mind .. Its working ;) 

Thanks