This plugin converts text entered in the Scrippet format to properly styled HTML.
First, please make sure you are inputting the text in the right format. (Line spacing is important!)
However, if you're doing it right and it's still not looking right, please go to scrippets.org for troubleshooting help or to submit a bug report.
The Scrippets settings panel in your WordPress administrator's page has several settings that you can change to better suit your blog's design.
However, if those options are insufficient, you can modify the scrippets.css file in "wp-scrippets" plugin folder. Be advised that updates to the Scrippets plugin will overwrite your changes, so you should back them up and remember to add them back in whenever the plugin gets updated.