<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: black;
color: white;
}
h1 {
font-size: 24px;
font-weight: bold;
}
p {
font-size: 16px;
line-height: 1.5;
}
.code {
font-family: "Courier New", monospace;
}
</style>
</head>
<body>
<h1>黑色背景代码示例</h1>
<p class="code">
function calculateSum(a, b) {
return a + b;
}
const result = calculateSum(10, 20);
console.log(result);
</p>
</body>
</html>