Can you make it smaller?

You can do that with custom CSS.

#jkl_thebox {
    width: 400px;
    float: right;
}

That will shrink the box size and float it to the right of your content. 400px wide is the minimum width to avoid link text overflowing.

In an upcoming version of the plugin, I’ll make it easier to resize and float the box based on options you give it.