Hi, wondering if anyone can help me with this. I created a header in the exact suggested dimensions, but it keeps turning out slightly blurry online. I think the suggested width is actually wrong too because it says it should be 580 pixels, but I notice on the front page of the theme that the header stretches longer than the featured image, which is 640 pixels. Does anyone know how to fix this or whom I should ask for help? Do I need to contact the theme creators directly?