How can a header image be displayed 100%

Hi, i placed an image in the header but it does not fill the entire area of the header, there is space all around it, if I make it bigger it will not be centered, please take a look at my page:

Thank you

http://amcca.ca/new/my-amc/coupons/mont-tremblant/

Inject this CSS codes to your form. This should fit the image perfectly in the header.

.header-logo-left {

    margin-right: 0;

}

.form-header-group {

    padding: 0 !important;

    margin: 0 !important;

}

.header-text.httac.htvam {

    display: none;

}

.header-logo-left {

    margin-right: 0;

    width: 100%;

}

Guide: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

This is how it should look after:

Thank you that worked very well.