The buttons settings contain the settings for your button and image styles across your webshop.
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To edit your Buttons settings you'll have to navigate to the settings.
Click on the 'Theme settings' in the left sidebar, its indicated with the following icon:

When clicked, on the right sidebar your theme settings will open:
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Now click on 'Buttons', the following settings will open:
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Height:
Set the height of the buttons, you can choose between: Large, Medium and small.
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​Style:
Set the style of the buttons, you can choose between: Solid and with shadow, Solid without shadow and outline.
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​Corners:
Set the roundness of the buttons corners, you can choose between: