changing line heigh

Hello,

I'm new using modules and I'm having problems trying to change styles in this blog

http://ivink.com/confundidos-entre-letras

I have set the line height of the blog post-body to

.blog-post div.post-body p {

line-height: 1.5;

font-family: droid-sans, sans-serif;

font-weight: 400;

}

but the line heigh continues showing this heigh

16.7999992370605px;

}

I've been exploring the code with firebug but not being able to figure out why heigh does not change.

Thanks for any help,

Ignacio