Re: How to adjust line spacing in my blog in Magento
At the moment your text summaries aren't contained within their own element so the best you can do is target .post-summary with css. I would recommend wrapping just the text in an element of their own and then modifying the style using line-height css statement.
Looks like some css overrides are in a local.css file so you could make the change there.
---- If you've found one of my answers useful, please give "Kudos" or "Accept as Solution" as appropriate. Thanks!