The Digistore24 upsell buy button comes in the default Light and Dark designs. You can also create and edit your own designs. You will be able to choose them when you set up the upsell flow. This allows you to customize the buy upsell button to match the website design of your upsell page.Log into your Digistore24 account.Go to Account > Conversion tools > Upsell buy button in the vendor view.Click on Add upsell buy button.Add a Name (internal). The name is only visible to you.Select an option from the Active field:Click on Yes if you want the Buy upsell button to be available immediately after saving. You can then select it when you set up the upsell flow.Click on No if you don't want to use the buy upsell button right now. You can also disable upsell buy buttons that are already being used here. If you do so, the default Light layout will be applied in all upsell positions where this layout was selected.Select the design basis for the new upsell buy button in the Design field.You can enter your Custom CSS code to make the upsell buy button look exactly the way you want. Contact a web designer if you need help with this.You can enter a text in the Do not buy link text field that overrides the default text for the Do not buy option in the upsell buy button.Select a product in the Preview product field to check what the upsell buy button will look like.Click on Save and update preview to apply the changes and see the preview for the selected product.  You can change the preview product as you like and then save it to test this design for different products.To actually apply the new design to an upsell product, select it when you set up your upsell flow for the desired upsell position.