CSS by Building a Cafe Menu - Step 59

Tell us what’s happening:
I dont know how to add a font fallback I looked on google yet no help

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Cafe Menu</title>
    <link href="styles.css" rel="stylesheet"/>
  </head>
  <body>
    <div class="menu">
      <main>
        <h1>CAMPER CAFE</h1>
        <p>Est. 2020</p>
        <section>
          <h2>Coffee</h2>
          <article class="item">
            <p class="flavor">French Vanilla</p><p class="price">3.00</p>
          </article>
          <article class="item">
            <p class="flavor">Caramel Macchiato</p><p class="price">3.75</p>
          </article>
          <article class="item">
            <p class="flavor">Pumpkin Spice</p><p class="price">3.50</p>
          </article>
          <article class="item">
            <p class="flavor">Hazelnut</p><p class="price">4.00</p>
          </article>
          <article class="item">
            <p class="flavor">Mocha</p><p class="price">4.50</p>
          </article>
        </section>
        <section>
          <h2>Desserts</h2>
          <article class="item">
            <p class="dessert">Donut</p><p class="price">1.50</p>
          </article>
          <article class="item">
            <p class="dessert">Cherry Pie</p><p class="price">2.75</p>
          </article>
          <article class="item">
            <p class="dessert">Cheesecake</p><p class="price">3.00</p>
          </article>
          <article class="item">
            <p class="dessert">Cinnamon Roll</p><p class="price">2.50</p>
          </article>
        </section>
      </main>
    </div>
  </body>
</html>
/* file: styles.css */
body {
  background-image: url(https://cdn.freecodecamp.org/curriculum/css-cafe/beans.jpg);
  font-family: sans-serif;
}

h1, h2, p {
  text-align: center;
}

.menu {
  width: 80%;
  background-color: burlywood;
  margin-left: auto;
  margin-right: auto;
  padding: 20px;
  max-width: 500px;
}


/* User Editable Region */

h1, h2 {
  font-family: Impact; 
  fallback: serif;
}

/* User Editable Region */


.item p {
  display: inline-block;
}

.flavor, .dessert {
  text-align: left;
  width: 75%;
}

.price {
  text-align: right;
  width: 25%
}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Challenge: Learn Basic CSS by Building a Cafe Menu - Step 59

Link to the challenge:

To add a font fallback in CSS, you can use the font-family property. You can specify a list of fonts separated by commas. The browser will try to use the first font in the list. If it is not available, it will move on to the next font in the list until it finds one that is available.
font-family: sans-serif, Arial;

Thanks for the help!