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E-Commerce platform has been growing in an unrelenting pace all over the globe. With technology of today, people are given the ease to access various e-stores through their mobile phone. This leads to a new trend of online shopping on mobile platform, which is one of the most preferred e-commerce. The successful interaction between e-commerce component and the end user is related to a readable, perceivable user interface (UI). This paper analyzes design principles of user interface used in popular e-commerce, through a case study, and how it affects the end user expectation and acceptance.