Customizing a Template - What are the specs for the cover page?

Interested in designing your own cover page? Here are the specs!

• Dimensions of a full page with no margins: 1421px by 1005px
• File Type: Web browser-supported images, such as .gif, .jpg or .png.
• File Size: 8MB max; although smaller is better (so it does not impact overall file size of the pdf)