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HTML

              
                <header class="header">
  <button class="menu-button">
    <span class="material-symbols-outlined icon">menu</span>
  </button>
  <img
    class="logo"
    src="https://assets.codepen.io/221808/uni-logo.svg"
    width="30"
    height="30"
    alt="UNI"
  />
</header>
<div class="container">
  <nav>
    <button>
      <span class="material-symbols-outlined">local_fire_department</span>急上昇
    </button>
    <button>
      <span class="material-symbols-outlined">music_note</span>音楽
    </button>
    <button>
      <span class="material-symbols-outlined">cruelty_free</span>動物
    </button>
    <button>
      <span class="material-symbols-outlined">sports_esports</span>ゲーム
    </button>
    <button>
      <span class="material-symbols-outlined icon">find_in_page</span>検索
    </button>
    <button>
      <span class="material-symbols-outlined icon">favorite</span>お気に入り
    </button>
    <button>
      <span class="material-symbols-outlined">history</span>
      履歴
    </button>
    <button>
      <span class="material-symbols-outlined icon">settings</span>
      設定
    </button>
    <button>
      <span class="material-symbols-outlined">help</span>
      ヘルプ
    </button>
  </nav>
  <main>
    <div class="inner">
      <div class="photo-list">
        <img
          src="https://assets.codepen.io/221808/a-grid-image-1.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-2.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-3.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-4.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-5.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-6.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-7.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-8.jpg"
          width="400"
          height="300"
          alt=""
        />
        <img
          src="https://assets.codepen.io/221808/a-grid-image-9.jpg"
          width="400"
          height="300"
          alt=""
        />
      </div>
    </div>
  </main>
</div>

              
            
!

CSS

              
                :root {
  --nav-width: 200px;
}

.container {
  display: grid;
  /* デフォルト状態の列サイズ */
  grid-template-columns: 40px 1fr;
  /* アニメーションの設定 */
  transition: 300ms all;
  gap: 12px;
}

.container.open {
  /* ナビゲーションが開いた状態での列サイズ  */
  grid-template-columns: var(--nav-width) 1fr;
}

nav button {
  width: var(--nav-width);
}

/* その他のスタイル */
body {
  font-family: "游ゴシック Medium", YuGothic, YuGothicM,
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 16px;
  padding: 12px;
  color: #030303;
}

.header {
  display: grid;
  justify-content: space-between;
  grid-template-areas: "menu logo .";
}

.header .menu-button {
  font-family: inherit;
  line-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-left: 4px;
  padding: 0;
  cursor: pointer;
  border: none;
  border-radius: 50%;
  background-color: transparent;
  grid-area: menu;
}

.header .logo {
  grid-area: logo;
}

.menu-button:is(:hover, :active) {
  background-color: #0000001a;
}

nav {
  padding-top: 12px;
}

nav .logo {
  margin-left: 10px;
}

nav button {
  font-size: 16px;
  display: flex;
  align-items: center;
  height: 40px;
  padding-left: 12px;
  cursor: pointer;
  transition: 300ms all;
  color: #333;
  border: none;
  outline: none;
  background-color: transparent;
  appearance: none;
  gap: 24px;
}

nav button:hover {
  background-color: #0000001a;
}

nav button .icon {
  font-size: 24px;
}

nav button:hover .icon {
  transition: 300ms all;
}

main {
  background: #ffffff;
}

main .photo-list {
  display: grid;
  align-items: start;
  margin-top: 12px;
  padding-right: 16px;
  padding-left: 16px;
  gap: 16px;
  grid-auto-rows: 260px;
  grid-template-columns: repeat(3, minmax(100px, 1fr));
}

main .photo-list img {
  width: 100%;
  height: 100%;
  border-radius: 4px;
  object-fit: cover;
}

              
            
!

JS

              
                // メニューボタンをクリックするたびに、.containerのCSSに.openを着脱するための処理です
const container = document.querySelector(".container");

document.querySelector(".menu-button").addEventListener("click", () => {
  container.classList.toggle("open");
});

              
            
!
999px

Console