In order to create a box shadow on certain elements you can use CSS. This tutorial explains how you can create a neat shadow for your boxes.
Go to the custom css section of the module and add this for your element
.blogitem{box-shadow: 0px 5px 20px 0px rgba(0, 0, 0, 0.1); }
The box-shadow CSS property adds shadow effects around an element's frame. You can set multiple effects separated by commas. A box shadow is described by X and Y offsets relative to the element, blur and spread radii, and color.
The box-shadow property enables you to cast a drop shadow from the frame of almost any element. If a border-radius is specified on the element with a box shadow, the box shadow takes on the same rounded corners.