Powerpoint design is the most important yet the most intricate part of the overall presentation. The reason is that if your presentation is boring and have dull and dark colours only it will do no good to the eyes of the audience. On the contrary, if your design and the overall theme are too colourful then it will be distracting for the audience too. A sales PowerPoint presentation design should contain a moderate quantity and hierarchy of colours. The selection of the colours should be well thought and you should always go for the basic colours like blue and white, which are charming for the eyes.