Add Shadows to ShopIsle Slider Text and Button

Start off by installing the plugin Advanced CSS Editor and in Appearance -> Customize -> Advanced CSS Editor add the following code which applies to you:

Slider Header Text:

.mb-30{
 text-shadow: 2px 2px 3px black;
}
Slider Sub Text
.mb-40{
 text-shadow: 2px 2px 3px black;
}
Slider Button
.btn.btn-border-w{
box-shadow: 2px 2px 3px black;
}

Details about text shadow could be seen here: 

http://www.w3schools.com/cssref/css3_pr_text-shadow.asp

http://www.w3schools.com/cssref/css3_pr_box-shadow.asp