You can. The whole output is encased in a <div> with a class of np- followed by the plugin name (lower case and spaces converted to dashes).
<div>
class
np-
Each section that has a <div> around it with a class of np- followed by the section name (lower case and spaces converted to dashes).
The download link has an additional <div> around it with a class of np-download-link.
np-download-link
Screenshots have a <div> with a class of np-screenshotx, where x is the screenshot number.
np-screenshotx
x
Each of these div's can therefore be styled using your theme stylesheet.
div
There was an error while loading. Please reload this page.