Keep it consistent

Consistency is crucial for any presentation — consistency in terms of tone of voice, layout, imagery, and everything else. It’s easy advice to give but hard to achieve and maintain. More often than not, we end up with something that looks more like a patchwork quilt. This is especially true if you add slides from other presentations.
Color schemes from other documents, misaligned text, varying fonts, and other inconsistencies can afflict your presentation, especially when it’s being built collaboratively. Keep an eye on the overall look and feel of your presentation, as well as the formatting details, to create a consistent and cohesive whole.