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<!doctype html>
<style>
.header {
height: 100px;
background-color: green;
}
</style>
<div id="container">
<div class="header"></div>
</div>
<!doctype html>
<style>
.header {
height: 100px;
background-color: green;
}
</style>
<div id="container">
<div class="header"></div>
</div>