<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
    #one { color: #66FF66; }
</style>
<body>
    <p id="one">This text should be light green (the same color as the line below).</p>
    <p id="one">This text should be light green (the same color as the line above).</p>
</body>