A4 or 8.27 x 11.69 inches (21 x 29.7 cm)

You're looking for a paper covering or a design template for a 16-line Quran dual-page PDF. Here are some possible solutions:

You can use a template to create a 16-line Quran dual-page PDF. Here's a simple template you can use:

Here's an example of what the first two pages of a 16-line Quran dual-page PDF might look like: