hello,i just cant seem to figure out the css styles part
**Your code so far**
<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
<link rel="stylesheet" href="styles.css">
<header id="header">
<meta charset="UTF-8"></meta>
<link rel="stylesheet" href="styles.css">
<img id="header-img" src="https://cdn.freecodecamp.org/testable-projects-fcc/images/product-landing-page-logo.png">
<section class="main-section" id="features"></section>
<section class="main-section" id="how_it_works"></section>
<section class="main-section" id="pricing"></section>
<nav id="nav-bar">
<a class="nav-link" href="#features"> </a>
<a class="nav-link" href="#how_it_works"></a>
<a class="nav-link" href="#pricing"></a>
</nav>
</header>
<body>
<iframe id="video" src="https://youtu.be/y8Yv4pnO7qc"></iframe>
<form id="form" action="https://www.freecodecamp.com/email-submit" >
<input id="email"placeholder="enter your email address" type="email" name="email"></input>
<input id="submit" type="submit"></input></form>
</div>
</body>
</html>
/* file: styles.css */
@media (max-width: 600px){
.header{
background-color:grey;
}
}
body{
display:flex;
flex-direction:column;
flex-wrap:wrap;
justify-content: center;
align-items:center;
}
#header-img{
display:flex;
flex-direction:column;
flex-wrap:wrap;
justify-content: center;
align-items:center;
}
**Your browser information:**
User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
Challenge: Product Landing Page - Build a Product Landing Page
Link to the challenge: