frame around the photos | WordPress.org

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Hi,
I would like to change to Modula Gallery on the above mentioned website.
But in Modula the images get a frame from the CSS

img {
  background-color: #FFF;
  padding: 10px;
  border-radius: 10px;
  border: 2px solid #999;
}

On the same page I put the originally Envira Gallery which is without the frame.
How can I avoid the frame with Modula?

Thank you very much for your help
Stefan

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