<header class="header">
  <div class="header__layout">
    <h1 class="header__logo">
      <a href="#">ここにロゴ</a>
    </h1>
    <nav class="header__nav">
      <ul class="header__menus">
        <li class="header__menu">
          <a href="#">メニュー</a>
        </li>
        <li class="header__menu">
          <a href="#">メニュー</a>
        </li>
        <li class="header__menu">
          <a href="#">メニュー</a>
        </li>
        <li class="header__menu">
          <a href="#">メニュー</a>
        </li>
      </ul>
    </nav>
    <!-- ハンバーガーメニューで使用するアイコン -->
    <div class="hamburger">
      <div class="hamburger__icon">
        <div class="hamburger__bar"></div>
        <div class="hamburger__bar"></div>
        <div class="hamburger__bar"></div>
      </div>
    </div>
  </div>
</header>
/* リセットCSS */
a {
  color: inherit;
  text-decoration: none;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ヘッダーで使用 */
.header {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background-color: #5CC0EF;
}

.header__layout {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: inherit;
  margin: 0 auto;
  padding: 0 20px;
}

.header__logo {
  position: relative;
  z-index: 12;
}

.header__logo a {
  font-size: 24px;
  color: #fff;
}

.header__nav {
  height: inherit;
}

@media screen and (max-width: 767px) {
  .header__nav {
    display: none;
  }
}

.header__menus {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  height: inherit;
}

.header__menu {
  height: inherit;
}

.header__menu a {
  display: flex;
  align-items: center;
  justify-content: center;
  height: inherit;
  font-size: 18px;
  color: #fff;
  transition: all 0.3s;
}

.header__menu a:hover {
  color: #ffe100;
}

/* ハンバーガーメニュー関連 */
.hamburger {
  display: none;
}
 
@media screen and (max-width: 767px) {
  .hamburger {
    display: block;
  }
}

.hamburger__icon {
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 40px;
  height: 32px;
}

.hamburger__icon:hover .hamburger__bar {
  background-color: #ffe100;
}

.hamburger__icon .hamburger__bar {
  background-color: #fff;
  border-radius: 2px;
  width: 100%;
  height: 3px;
  transition: all 0.3s;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.