How to customize popular post widget in blogger
To customize this widget first you need to add this widget from layout. Now select your favorite style from below five styles, view its coding and copy CSS code from pop window.
Then login to your blogger account, select template and edit html after proceeding you can see your blog html and css coding. Now search ]]></b:skin> (you can use ctrl+f from your keyboard to find easily) and paste just above from this tag and save template, now view your blog. I hope you successfully apply css style in the popular posts widget.
Style 1. Colorful popular posts
With the help of below CSS code you can add a colorful in this widget. For every post separate color with image css3 and we can up to eight colors.