Styling Widgets and Shortcodes

Greetings..
Im very interested to know how can I add and improve the stylings from:
1.- Most Voted Widget. (Also being able to show the most voted on the DAY or WEEK)
2.- Most Voted shortcode, also the ability to filter by most voted per DAY, WEEK, MONTH and YEAR.
This shortcodes are being used in Pages and Widgets only.
Please let me know the Filenames and if you can it would be great to know the code line.
Thanks in advance!