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失败：每个
.nav-link元素都应该有一个href属性。 -
失败:每个
.nav-link元素都应该链接到登录页上的相应元素（有一个href值是另一个元素的 id。例如#footer）。
你目前的代码
警告
挑战的种子代码和/或你的解决方案超过了我们从挑战传送的最大长度。
你需要在此采取额外步骤，以确保你写的代码可以轻松地被阅读。
请复制/粘贴所有在挑战中编辑器所显示的代码。
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<header id="header">
<div class="logo">
<img id="header-img" src="https://cdn.freecodecamp.org/testable-projects-fcc/images/product-landing-page-logo.png" alt="original trombones logo" />
</div>
<nav id="nav-bar">
<ul>
<li class="nav-link" href="#features" >Features</li>
<li class="nav-link" href="#how-it-work">How It Work</li>
<li class="nav-link" href="#pricing">Pricing</li>
</ul>
</nav>
</header>
<div class="container"></div>
<section id="hero">
<h2>Handcrafted, home-made masterpieces</h2>
<form id="form" action="https://www.freecodecamp.com/email-submit">
<input name="email" id="email" type="email" placeholder="Enter your email address" required />
<input id="submit" type="submit" value="Get Started" class="btn" />
</form>
</section>
<div class="container">
<section id="features">
<div class="grid">
<div class="icon"><i class="fa fa-3x fa-fire"></i></div>
<div class="desc">
<h2>Premium Materials</h2>
<p> Our trombones use the shiniest brass which is sourced locally. This will increase the longevity of your purchase. </p>
</div>
</div>
<div class="grid">
<div class="icon"><i class="fa fa-3x fa-truck"></i></div>
<div class="desc">
<h2>Fast Shipping</h2>
<p> We make sure you recieve your trombone as soon as we have finished making it. We also provide free returns if you are not satisfied. </p>
</div>
</div>
<div class="grid">
<div class="icon">
<i class="fa fa-3x fa-battery-full" aria-hidden="true"></i>
</div>
<div class="desc">
<h2>Quality Assurance</h2>
<p> For every purchase you make, we will ensure there are no damages or faults and we will check and test the pitch of your instrument. </p>
</div>
</div>
</section>
<section id="how-it-works">
<iframe id="video" height="315" src="https://www.youtube-nocookie.com/embed/y8Yv4pnO7qc?rel=0&controls=0&showinfo=0" frameborder="0" allowfullscreen ></iframe>
</section>
<section id="pricing">
<div class="product" id="tenor">
<div class="level">Tenor Trombone</div>
<h2>$600</h2>
<ol>
<li>Lorem ipsum.</li>
<li>Lorem ipsum.</li>
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<li>Lorem ipsum.</li>
</ol>
<button class="btn">Select</button>
</div>
<div class="product" id="bass">
<div class="level">Bass Trombone</div>
<h2>$900</h2>
<ol>
<li>Lorem ipsum.</li>
<li>Lorem ipsum.</li>
<li>Lorem ipsum dolor.</li>
<li>Lorem ipsum.</li>
</ol>
<button class="btn">Select</button>
</div>
<div class="product" id="valve">
<div class="level">Valve Trombone</div>
<h2>$1200</h2>
<ol>
<li>Plays similar to a Trumpet</li>
<li>Great for Jazz Bands</li>
<li>Lorem ipsum dolor.</li>
<li>Lorem ipsum.</li>
</ol>
<button class="btn">Select</button>
</div>
</section>
<footer>
<ul>
<li><a href="#">Privacy</a></li>
<li><a href="#">Terms</a></li>
<li><a href="#">Contact</a></li>
</ul>
<span>Copyright 2016, Original Trombones</span>
</footer>
</div>
</div>
</body>
</html>
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挑战： 响应式网页设计项目 - 制作一个产品登录页
挑战的链接：