<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body style="padding: 0; margin: 0;">
<div>
<span>Birinci div!</span>
</div>
<div style="background-color: black; height: 3vh; color: white; display: flex; justify-content: center; align-items: center;">
<span>İkinci div!</span>
</div>
</body>
</html>