Responsive Web Design Projects - Build a Product Landing Page

Tell us what’s happening:
Describe your issue in detail here.

   **Your code so far**
/* file: index.html */
<!DOCTYPE html>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>web landing</title>
	<header id="header">
		<img id="header-img" src="" alt="gambar-produk">
		<nav id="nav-bar">
			<div class="nav-link">
				<a href="#footer">fvooter</a>
			<div class="nav-link">
				<a href="#testimoni">testimoni</a>
			<div class="nav-link">
				<a href="#footer">footer</a>
	<div id="konten">
		<section id="produk">a</section>
		<section id="testimoni">c</section>
		<iframe id="video" width="560" height="315" src="" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
		<div id="footer">b</section>
	<form id="form">
		<input type="email" name="email" id="email" required placeholder="masukan email">
		<input id="submit" type="submit"**strong text**>
		<a href="">kirim</a>

/* file: styles.css */

   **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

Challenge: Responsive Web Design Projects - Build a Product Landing Page

Link to the challenge:

You’re failing several tests. It would be great if you told us which one you want help with.