You can design your shop banner using graphic editors such as Adobe® Photoshop.
For best results, your banner image should be less than 10 MB in size, have dimensions of 1200 x 245 pixels and be saved in .jpg or .png format. Banners with incorrect dimensions may not be displayed correctly. Designing your shop banner can be as simple as choosing a background picture and then adding your shop name on top of it (make sure it's legible!).
Shop banners are the first thing customers see, so make it memorable!