Modify CSS and fix code for new site layout

We have an existing HTML code which outputs a postcode lookup form on the website. This application gives an instant result based on the entry. We have the full code and data-set, but we need to modify its CSS and styling to match our new web design.

The code also needs troubleshooting for missing or extra tags, as it currently interferes with the page layout of the site (elements being mis-aligned etc).

Colours should be changed to #933968
Buttons should match the style used on the site.

As we have the code already, it should be a relatively quick fix. Please drop me a message and I can forward the current code.