window {
   background-image: url("/tmp/image.png");
   background-size: cover;
   background-repeat: no-repeat;
   background-position: center;
   background-color: rgba(0, 0, 0, 0);
}

#window-box {
   padding: 64px;
   border-radius: 30px;
   background-color: rgba(32, 32, 32, 0.8);
}