My header has disappeared/lost its formatting; Its suddenly not applying some of the custom css

RE: https://heritagecountrypottery.comMy header has disappeared/lost its formatting; its suddenly not applying some of the custom css.I am using Intuition Pro who have gone bust so I cannot ask their developers.The header should look like this... http://garryrigby.com/no-header.jpgI restored the website oo March 12th when everything was working fine. In a few hours I lose the header again