<div class="container">
  <nav>
    <ul class="link-list">
      <li>
        <a class="link current" href="#🥺">
          <span class="material-icons">home</span>ホーム
        </a>
      </li>
      <li>
        <a class="link" href="#🤔"> <span class="material-icons">explore</span>探索</a>
      </li>
      <li>
        <a class="link" href="#😡"> <span class="material-icons">history</span>履歴</a>
      </li>
      <li>
        <a class="link" href="#🥶">
          <span class="material-icons">recommend</span>お気に入り
        </a>
      </li>
      <li>
        <a class="link" href="#🤩"> <span class="material-icons">settings</span>設定</a>
      </li>
    </ul>
  </nav>
  <main class="js-main main">🥺</main>
</div>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

ul {
  list-style: none;
}

html,
body {
  background-color: #fff;
  text-align: left;
  height: 100%;
}

.material-icons {
  font-family: "Material Icons";
  font-weight: normal;
  font-style: normal;
  font-size: 24px; /* Preferred icon size */
  display: inline-block;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;

  /* Support for all WebKit browsers. */
  -webkit-font-smoothing: antialiased;
  /* Support for Safari and Chrome. */
  text-rendering: optimizeLegibility;

  /* Support for Firefox. */
  -moz-osx-font-smoothing: grayscale;

  /* Support for IE. */
  font-feature-settings: "liga";
}

.container {
  display: grid;
  height: 100%;
  grid-template-columns: 240px 1fr;
}

.link {
  font-family: sans-serif;
  color: #333333;
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 16px;
  padding-left: 24px;
  padding-right: 24px;
  height: 48px;
  text-align: center;
  text-decoration: none;
}

.link-list .link:is(:hover, .current) {
  color: white;
  background-color: #333333;
}

.main {
  background-color: #e8e8e8;
  display: grid;
  place-content: center;
  font-size: min(calc(80vw - 240px), 60vh);
}

const main = document.querySelector(".js-main");

const createFace = (index) => {
  switch (index) {
    case 0:
      return "🥺";
    case 1:
      return "🤔";
    case 2:
      return "😡";
    case 3:
      return "🥶";
    case 4:
      return "🤩";
  }
};

document.querySelectorAll("a").forEach((anchorElement, index) => {
  anchorElement.addEventListener("click", (event) => {
    main.textContent = createFace(index);

    document.querySelectorAll("a").forEach((otherElement) => {
      otherElement.classList.remove("current");
    });

    anchorElement.classList.add("current");
    event.preventDefault();
  });
});