e-newsletter html and customization

Hi, Hope someone is able to help.

On my site i have a default newsletter subscription form that fits my design. I want to replace the form with the e-newsletter form but keep the design. Of course the design is described in a css file. Working with the shortcode left me with the ugly default subscribe button which is not an option.

I want to know what i can do to make the subscribtion form exactly the same as my current form.
I also want to use the form on a website that is not Wordppress based, so i would need a html form tthat i would think.

Thanks in advance for the help.