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<style>
:root {
font-size: 30px;
width: 300px;
border-bottom: 1px solid #f00;
}
body {
font-size: 25px;
}
</style>
<body>Level 1</body>
<style>
:root {
font-size: 30px;
width: 300px;
border-bottom: 1px solid #f00;
}
body {
font-size: 25px;
}
</style>
<body>Level 1</body>