Viewing github.com/facebook/react/packages/react-devtools-extensions/panel.html

```
<!doctype html>
```
```
<html style="display: flex">
```
```
    <head>
```
```
        <meta charset="utf8">
```
```
        <style>
```
```
            html {
```
```
                display: flex;
```
```
            }
```
```
            body {
```
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                margin: 0;
```
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                padding: 0;
```
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                flex: 1;
```
```
                display: flex;
```
```
            }
```
```
            #container {
```
```
                display: flex;
```
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                flex: 1;
```
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                width: 100%;
```
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                position: fixed;
```
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                top: 0;
```
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                left: 0;
```
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                right: 0;
```
```
                bottom: 0;
```
```
            }
```
```
            .no-react-disclaimer {
```
```
              margin: 16px;
```

              font-family: Courier, monospace, serif;

```
              font-size: 16px;
```

              animation: fadeIn .5s ease-in-out forwards;

```
            }
```
```
            @keyframes fadeIn {
```
```
              0% {
```
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                opacity: 0;
```
```
              }
```
```
              100% {
```
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                opacity: 1;
```
```
              }
```
```
            }
```

            @media (prefers-color-scheme: dark) {

```
              :root {
```
```
                color-scheme: dark;
```
```
              }
```

              @supports (-moz-appearance:none) {

```
                :root {
```
```
                  background: black;
```
```
                }
```
```
                body {
```
```
                  color: white;
```
```
                }
```
```
              }
```
```
            }
```
```
        </style>
```
```
    </head>
```
```
    <body>
```

        <!-- main react mount point -->

```
        <div id="container">
```

          <h1 class="no-react-disclaimer">Looks like this page doesn't have React, or it hasn't been loaded yet.</h1>

```
        </div>
```

        <script src="./build/panel.js"></script>

```
    </body>
```
```
</html>
```

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