E-commerce Product Page

Hi! First of all, I would like to receive any suggestion or recommendation from you, they will be of great help to me so please don't hesitate. Secondly, I found that I should had used sass or divide the styles in different documents but I realized that too late and I didn't want to waste more time on that, the styles took me more time than the scripts, because I look for tablet design too. Hope you like it!