Poor quality logo.png

Dear readders,

Hope you can help.

I have created a logo, and saved it as logo.png.

Now, that I have uploaded it to my themes/images folder, it comes up kinda blurry and slightly bigger than the original.

You can see it here: http://www.eday.nl

Does anyone know of a way to keep the right dimensions and sharpness?

Many thanks in advance,

Richard.