老师，能否帮我检查一下代码吗

来源：3-4 自由编程

PADAopanda

2021-08-30 15:01:15

<!DOCTYPE html>
<html lang="en">

<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>头部header</title>
<link rel="stylesheet" href="css/base.css">
    <style>
/*-- 布局 start --*/
html,
body {
width: 100%;
height: 100%;
}

/*header*/
.header-container {
width: 100%;
height: 2.5rem;
background-color: rgba(209, 214, 215, 0.9);
}

.header-container .navbar {
height: 100%;
display: flex;
justify-content: space-between;
align-items: center;
}

/* logo */
.navbar .logo {
width: 8rem;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
}

.navbar .downloadApp {
width: 4rem;
height: 100%;
margin-right: 1rem;
display: flex;
justify-content: center;
align-items: center;
}
.navbar .downloadApp .download-link{
height: 1.5rem;
line-height: 0.5rem;
font-size: 0.5rem;
font-weight: bold;
display: block;
text-align: center;
background-color: rgb(239, 202, 202);
padding: 0.5rem;
border-radius: 0.5rem;
}
</style>
    <script src="js/flexible.js"></script>
</head>

<body>
<div class="header-container">
<div class="navbar">
<div class="logo">
<img src="img/mooc-logo.png" alt="mooc">
</div>
<div class="downloadApp">
<a href="" class="download-link">下载APP</a>
</div>
</div>
</div>
</body>

</html>