Original theme color shows at the back of header when refreshing/reloading the site

[ccva]

I hope I'm posting the right place. Apologies if I am not.

I'm new to Studiopress and tried creating a site this week using the Lifestyle theme. For the most part the site is finished, however, I've noticed that when I refresh/reload the site, I can see the original blue color, right behind the header. I've tried going into the stylesheet to see what I missed but I just cannot figure it out. The site is http://allbyhisgrace.com and I would appreciate any feedback regarding what I need to do to remove the background color that shows up behind the header when the site is loading.