css如何设置字体样式

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Font Styling</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            font-size: 16px;
            color: #333;
        }
        h1 {
            font-weight: bold;
            font-style: italic;
        }
    </style>
</head>
<body>
    <h1>Welcome to My Website</h1>
    <p>This is a paragraph with some text.</p>
</body>
</html>

<link href="https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap" rel="stylesheet">
<style>
    body {
        font-family: 'Roboto', sans-serif;
    }
</style>

@font-face {
    font-family: 'MyCustomFont';
    src: url('mycustomfont.woff2') format('woff2');
    font-display: swap;
}