Zoom overlay sits behind Docsaurus nav bar

[nomicode]

When I added your plugin to my site, I noticed that the zoom overlay appears behind the Docusaurus nav bar (which is set to z-index: 200). I was able to fix this issue with the following in my custom.css:

.medium-zoom-overlay,
.medium-zoom-image {
  z-index: 9999;
}

Perhaps it would be worthwhile to include this by default with your plugin?

[fermelone]

One way you can solve this too is adding custom options on the docusaurus.config.js:

zoom: {
    selector: '.markdown :not(em) > img',
    config: {
      // options you can specify via https://github.com/francoischalifour/medium-zoom#usage
      margin: 16,
      container: {
        top: 50 // <-- the nav bar thickness
      },
      background: {
        light: '#FFFFFF',
        dark: '#001D79'
      },
    }
  }