I searched through the site and I couldn't find an answer to this specific question, so here we go:
I've designed a business card in Illustrator. The background is a darker red. I export it as a PDF and it looks great. Here's what the PDF looks like:
The problem is when I upload it to the card printing site (I'm using got print) the upload has a solid black background, like so:
So, is the site just displaying it funny and they should print fine? Or am I doing something wrong? I've made sure it's CMYK not RGB, but I can't figure out what I'm doing wrong.