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                <div class="contacts">
  <h1 class="contacts__title">My contacts</h1>
  <section class="contacts__section">
    <h2 class="contacts__subtitle">A</h2>
    <ul class="contacts__list">
      <li class="contacts__item">Ty Adamson</li>
      <li class="contacts__item">Elyse Andrews</li>
      <li class="contacts__item">Judith Aronson</li>
      <li class="contacts__item">Liv Assimos</li>
  <section class="contacts__section">
    <h2 class="contacts__subtitle">B</h2>
    <ul class="contacts__list">
      <li class="contacts__item">Aaron Bacon</li>
      <li class="contacts__item">Eric Bailey</li>
      <li class="contacts__item">Jordan Beyer</li>
      <li class="contacts__item">Aditi Bhandari</li>
      <li class="contacts__item">Judy Blomquist</li>
      <li class="contacts__item">Mike Borsare</li>
  <section class="contacts__section">
    <h2 class="contacts__subtitle">C</h2>
    <ul class="contacts__list">
      <li class="contacts__item">Lindsay Cardinale</li>
      <li class="contacts__item">Alvin Chang</li>
      <li class="contacts__item">Marlene Chow</li>
      <li class="contacts__item">Lindsey Christensen</li>
      <li class="contacts__item">Tiffany Chu</li>
      <li class="contacts__item">Chris Ciocca</li>


                body {
  font-family: monospace;

.contacts {
  background-color: lavender;
  padding: 1rem;
  height: 50vh;
  margin: 2rem auto;
  max-width: 30rem;
  overflow: scroll;

.contacts__title {
  padding-bottom: 1rem;
  text-align: center;

.contacts__subtitle {
  background-color: rgba(white, 0.5);
  padding: 0.5rem;
  position: sticky;
  top: 0;

.contacts__list {
  list-style: none;
  margin: 0;
  padding: 0;

.contacts__item:not(:last-child) {
  margin-bottom: 1rem;