Wikidot Community

It's your theme's CSS that determines the style of the blockquotes. Your site with the recent edits (http://rhetoricalgoddess.wikidot.com) is using this CSS;

blockquote {
    border: 1px dashed #999;
    padding: 0 1em;
    background-color: #f4f4f4;
}

I think you can add some custom CSS to your global CSS page to tweak your blockquote look:
http://rhetoricalgoddess.wikidot.com/css:global-css

I quick way to confirm that's the right place is to paste inthe above CSS on that page and then tweak the background color or border and see if the changes are applied. You may need to edit/save a page to get the new settings to appear.