Customise the look of your Heracleum Referrer List:
Define the style of elements of which the list is composed.
View results in the Preview frame at the bottom and when you think it is good click the "View Code" button. Select and copy the code provided, paste it into your page and check if also there your Referrer List is looking as desired.
Beyond aesthetics, it is fundamental to set the dimension of the list box (highlighted in red), specially if you want to place it into narrow side bars or columns of your page layout.