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You can customize the appearance of the Checkout and Apply buttons displayed in your floating cart. These settings are located in the Button Settings section of the Customize Appearance tab.
Click the Store link.
Note: Buttons displayed in the Styles and Colors Preview module include a beveled border. The beveled border does not appear for buttons on your live store. This is a known issue that is currently being investigated.
Button settings may also be customized using custom CSS. This is an advanced option, recommended only for developers or merchants familiar with CSS.