fastlion-picture-viewer/src/component/index.css

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.react-picture-viewer {
  position: relative;
  display: block;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.react-picture-viewer-bofore-loaded {
  display: flex;
  justify-content: center;
  align-items: center;
}
.react-picture-viewer-bofore-loaded img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.react-picture-viewer img {
  cursor: move;
  position: absolute;
}