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Hi there and thanks for the interest. I will have to get back to you on this as it was something I had overlooked. If you can work around it then please go ahead but if you do need the format to continue then I will take a look tonight and get back to you with measurements.

Sorry for the slow reply. The format is 8.5cm x 11cm
Here is a link to a website I may use to produce them: https://www.psprint.com/design-templates/brochures/br-4267/

Thanks again for the interest :) Look forward to seeing your design.

Thanks. Just one more question. Do I have to make a post of my design and place link in comment section of this post, as these things works on Steemit?

If you want to make a post about it please do, i'll certainly re-steem and upvote it. As for the competition it is by no means something you have to do to enter.