Customize Zendesk customer portal header / footer and .css

General information for the website: it services
Description of every page/module: I want to use zendesk but want the site to integrate with my site seamlessly.

Thanks.
Description of requirements/features: Seamless integration. I want it to seem a part of the site.
Specific technologies required: html5 css zendesk

This is my site: www.realvirtual.com.mx
This is my zendesk: realvirtualpac.zendesk.com

I'm attaching a .zip file with my site's homepage so you can look at the header and footer code. Also the .css files.

I'm attaching a file with the way I want the portal to look.

All payments will be made through PPH.
All communication has to be done through PPH

The job is for customer portal design only.
Need job done ASAP.