i can’t seem to make my landing page responsive,it is not fitting for smaller size
<!DOCTYPE html>
<html>
<head>
<meta charset='UTF-8'>
<meta name='viewport' content='width=device-width, initial-scale='1.0'>
<link rel='stylesheet' href='styles.css'>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<title>Product Landing Page</title>
</head>
<body>
<main>
<header id='header'>
<img src='https://cdn.freecodecamp.org/testable-projects-fcc/images/product-landing-page-logo.png'id='header-img' alt='logo'>
<nav id='nav-bar'>
<ul>
<li><a href='#features'class='nav-link'>Features</a></li>
<li><a href='#how-it-works' class='nav-link'>How it works</a></li>
<li><a href='#pricing'class='nav-link' >Pricing</a></li>
</nav>
</header>
<div id='content'>
<div>
<h1>Handcrafted, home-made masterpieces<h1>
<form id='form' action='https://www.freecodecamp.com/email-submit'><input type='email' name='email' id='email' placeholder='Enter email address'>
<input type='submit' value='GET STARTED' id='submit'>
</form>
</div>
<div id='features'>
<div>
<div class='fire'><i class='fa fa-fire fa-3x'></i></div>
<div class='features-list' >
<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>
<div class='truck'><i class='fa fa-truck fa-3x fa-flip-horizontal'></i></div>
<div class='features-list'><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>
<div class='battery'><i class='fa fa-battery fa-3x'></i></div>
<div class='features-list' ><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>
</div>
<div id='how-it-works'>
<iframe id='video' width='500' height='400' src='https://www.youtube.com/embed/y8Yv4pnO7qc'></iframe>
</div>
<div id='pricing'>
<div class=' tenor trombone'>
<div class='type'>TENOR TROMBONE</div>
<p class='price'>$600</p>
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<button type='button'>SELECT</button>
</div>
<div class=' bass trombone' >
<div class='type'>BASS TROMBONE</div>
<p class='price'>$900</p>
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<button type='button'>SELECT</button>
</div>
<div class=' valve trombone'>
<div class='type' >VALVE TROMBONE</div>
<p class='price'>$1200</p>
<p>Plays similar to a Trumpet</p>
<p>Great for Jazz Bands</p>
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<button type='button'>SELECT</button>
</div>
</div>
<footer>
<ul>
<li><a href='#privacy'>Privacy</a></li>
<li><a href='#terms'>Terms</a></li>
<li><a href='#conditions'>Contact</a></li>
</ul>
<p>Copyright 2016, Original Trombones</p>
</footer>
<div>
</main>
</body>
</html>
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Challenge: Product Landing Page - Build a Product Landing Page
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