Blurry Logo

I’ve uploaded a logo to our site, but it keeps showing up blurry. The image itself looks great until it gets uploaded, then turns sort-of blurry instead of nice and crisp. I’ve tried uploading the original png file, which is huge, then resizing through the media editor. I’ve also tried resizing the image before I upload it. Here’s the site: http://www.somdparents.com. Any ideas what’s going on or how to fix it?