This canva program is for people at home without and formal graphic design training who would like to fancy themselves as graphic artist to play. The use templates and they don't set anything to the actual size and space you are designing for, which results in pixelled images when they need to blown up to fit the space. 

better to let an actual graphic designer do your work for you instead of playing pretend. Unless you are okay with me take a scalpel and doing open heart surgery because I watched a YouTube video that tells me how. Because that is the equivalent of the art I receive from canva users.