<html class="white-light">
 <head>
 </head>
 <body>
   <div class="root">
     White theme
   </div>
 </body>
</html>
.white-light body {
    --background: white;
    --color: black;
}

.root {
    background: var(--background);
    color: var(--color);
    padding: 30px;
}

External CSS

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External JavaScript

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