Change the styling of the buttons of the TakePicture web action

The TakePicture web action has buttons shown on the viewport for cancelling the image, approving the image and switching cameras. These buttons are white with no background and can sometimes be hard to see on a bright image. I would like to have some options to style these buttons like

• Changing colours
• Defining a background in a different colour
• Defining placement of the buttons on the screen. If you use the action on an iPad in portrait, actually tapping the buttons can be hard and it would be much nicer if I state that the buttons should be at the bottom of the viewport.