The purpose in having promotion popups is to maximize the conversions, and popups provide an incredible opportunity for this goal.
To have customer-engagement, organizations need to offer a discount, a coupon, a free trial or something valuable to customers.
The design of the popup is easily understandable, simple, attention-grabbing, and clear. Because the main aim of this campaign is to increase the attention of customers into offers of the company, using the image of an electronic guitar would work.
Furthermore, the action that the business wishes to be taken by customers is presented in white color in front of a black background. As you may notice, the black text in front of a grey background is less attractive than the white text in front of a black background.