index.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My Flexbox</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<article>
<img src="forest.png" width="240" height="160">
<div class="text">
<h1>タイトル</h1>
<p>こんにちは。こんにちは。</p>
</div>
</article>
</body>
</html>style.css
@charset "utf-8";
article {
display: flex;
gap: 16px;
}
.text {
background: pink;
flex: 1;
}