You got some unnecessary code in index.html file
<article class="card">
<div class="img-hero-wrapper">
<picture class>
<img class="img-hero" srcset="./images/illustration-hero.svg" alt="Someone dancing"/>
</picture>
</div>
Inside the main element just like
<main>
<img class="img-hero" srcset="./images/illustration-hero.svg" alt="Someone dancing"/>
Then proceed to add the h1 element right under follow by the p tag
Also the section inside the main is not needed cause its not a new section you're creating just a card. TO learn more about sections https://developer.mozilla.org/en-US/docs/Web/HTML/Element/section
so you can remove the picture tag and instead just give the img a class
<section class="plan">
<picture>
<img src="./images/icon-music.svg" alt="A musical note" />
</picture>
<div>
<h5>Annual Plan</h5>
<p>$59.99/year</p>
</div>
<button>Change</button>
</section>
instead do this
<div class="plan">
<img src="./images/icon-music.svg" alt="A musical note" />
<div class="plan2">
<h5>Annual Plan</h5>
<p>$59.99/year</p>
</div>
<button>Change</button>
</div>
</div>
Then you can make the necessary changes in your css file