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The option drop down

Hello everyone! I was wondering if it was possible for me to change the “Option box” that is pre-designed by webflow. For example : I added the option small medium large, on my product template, how can I change the box that contains them. I’m looking to remove the shadow-like effect and the radius. I tried everything but did not found the fix yet. Hopefully one of you will be able to help me out!

Good day to you all