Bubbles under Whitestone Dome Glass (S8+)

A few minutes ago I installed the Whitestone Dome Glass on my S8+. After the installation I noticed 3 small bubbles under the glass. Does anyone have any idea of what I should do?

The bubbles: http://imgur.com/hJRg8Vq

The bubbles (marked): http://imgur.com/sxLbPHj