<!DOCTYPE html>
<html>
<head>
<style>
.hometown
{
background-color:yellow;
}
</style>
</head>
<body>
<p>我是唐老鸭。</p>
<p class="hometown">我住在 Duckburg。</p>
<p>我是米老鼠。</p>
<p class="hometown">我也住在 Duckburg。</p>
</body>
</html>