Build an Event Hub - Build an Event Hub

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i cant clear 12 13 14 15. i have been searching for errors everywhere but its still not working

Your code so far

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

<head>
    <meta charset="utf-8">
    <title>Event Hub</title>
</head>

<body>
    <header>
        <h1>Event Hub</h1>
        <nav>
            <ul>
                <li><a href="#upcoming-events">Upcoming Events</a></li>
                <li><a href="#past-events">Past Events<a/></li>
            </ul>
        </nav>
    </header>
    <main>
        <section id="upcoming-events">
            <h2>Upcoming Events</h2>
            <article>
                <h3>AI & Machine Learning Conference 2025</h3>
                <p>Join us for a deep dive into the latest advancements in artificial intelligence and machine learning. Industry leaders will share insights and case studies on how AI is transforming various sectors.</p>
            </article>
            <article>
                <h3>Web Development Bootcamp</h3>
                <p>A hands-on workshop designed for developers looking to enhance their skills in modern web technologies including React, Node.js, and GraphQL. Perfect for both beginners and experienced developers.</p>
            </article>
        </section>
        <section id="past-events">
            <h2>Past Events</h2>
            <article>
                <h3>Cybersecurity Summit 2023</h3>
                <p>An event focusing on the latest trends and threats in cybersecurity. Experts discussed strategies for protecting data and ensuring privacy in an increasingly digital world.</p>
                <img src="https://cdn.freecodecamp.org/curriculum/labs/past-event1.jpg" alt="Cybersecurity Summt 2023">
            </article>
            <article>
                <h3>Blockchain Expo 2023</h3>
                <p>A comprehensive event covering the future of blockchain technology. Topics included decentralized finance (DeFi), smart contracts, and the impact of blockchain on various industries.</p>
                <img src="https://cdn.freecodecamp.org/curriculum/labs/past-event2.jpg" alt="Blockchain Expo 2023">
            </article>
        </section>
    </main>
</body>
    
</html>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Challenge Information:

Build an Event Hub - Build an Event Hub
https://www.freecodecamp.org/learn/full-stack-developer/lab-event-hub/lab-event-hub

2

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