The 2015 design trend showed a positive effect on the following aspects:
A] The flat design with a 'less is more approach' directs the focus towards the content to decrease the bounce rate, gradience in call-to-action button, drop shadows, easier to make responsive, and, etc.
Read more: http://www.sooperarticles.com/internet-articles/web-development-articles/over-view-e-commerce-website-design-trend-2015-2016-1466319.html

