Learn Basic CSS by Building a Cafe Menu - Step 52

how do I combine two class selectors in css

<!-- 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">
      <header>
        <h1>CAMPER CAFE</h1>
        <p>Est. 2020</p>
      </header>
      <main>
        <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>
        </section>
      </main>
    </div>
  </body>
</html>
/* file: styles.css */
body {
  background-image: url(https://cdn.freecodecamp.org/curriculum/css-cafe/beans.jpg);
}

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

.menu {
  width: 80%;
  background-color: burlywood;
  margin-left: auto;
  margin-right: auto;
}

.item p {
  display: inline-block;
}

.flavor {
  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/105.0.0.0 Safari/537.36

Challenge: Learn Basic CSS by Building a Cafe Menu - Step 52

Link to the challenge:

Look at how you created the selector list to center the text for the h1, h2 and p elements at the same time. What did you put between them in that list?