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CSS

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JavaScript

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HTML 

              
                <div class="container">
    <header class="header">
        <div class="header__inner" id="headerInner">
            <a class="header__logo" href="">
                <img src="https://zenweb.info/wp-content/uploads/2023/05/hamburger-dummy-logo-orange.svg" alt="dummy logo">
            </a>
            <div class="header__menu">
                <ul class="menu__list">
                    <li class="menu__item">
                    <a class="menu__link" href="">会社概要</a>
                    </li>
                    <li class="menu__item">
                    <a class="menu__link" href="">お知らせ</a>
                    </li>
                    <li class="menu__item">
                    <a class="menu__link" href="">採用情報</a>
                    </li>
                </ul>
            </div>
            <div class="header__menu-btn" id="spMenuBtn">
                <span></span>
                <span></span>
                <span></span>
                <span>MENU</span>
            </div>
        </div>
    </header>
</div>
!

CSS 

              
                /* すべての画面幅で適用されるCSS  */
.container {
    width: 100%;
}
.header {
    width: 100%;
    box-shadow: 0px 4px 4px -1px rgba(0,0,0,0.23);
}
.header__inner {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header__logo {
    display: block;
    font-size: 0;
}
.header__logo img {
    width: 100%;
    height: auto;
}

/* パソコンサイズ用のCSS  */
@media screen and (min-width:768px) {
    .header__inner {
        padding: 20px;
    }
    .header__logo {
        width: 160px;
        height: 19px;
        transition: opacity .2s ease;
    }
    .header__logo:hover {
        opacity: .7;
    }
    .menu__list {
        display: flex;
    }
    .menu__item:nth-child(n+2) {
        margin-left: 20px;
    }
    .menu__link {
        position: relative;
        display: block;
    }
    .menu__link::after {
        content: '';
        position: absolute;
        bottom: -5px;
        left: 0;
        width: 100%;
        height: 2px;
        background-color: #F5675B;
        transform: scaleX(0);
        transform-origin: left center;
        transition: transform .2s ease;
    }
    .menu__link:hover::after {
        transform: scaleX(1);
    }
    .header__menu-btn {
        display: none;
    }
}

/* スマートフォン、タブレットサイズ用のCSS */
@media screen and (max-width:767px) {
    .container {
        overflow: hidden;
    }
    .header {
        position: fixed;
        background: #fff;
    }
    .header__inner {
        position: relative;
        z-index: 10;
    }
    .header__logo {
        width: 125px;
        height: 15px;
        margin-left: 10px;
    }
    .header__menu {
        position: fixed;
        z-index: 5;
        top: 50px;
        width: 100%;
        height: calc(100vh - 50px);
        background: #fff;
        opacity: 0;
        visibility: hidden;
        transition: opacity .2s ease;
    }
    .header__inner.active .header__menu {
        opacity: 1;
        visibility: visible
    }
    .menu__list {
        border-top: 1px solid #d7d7d7;
    }
    .menu__item {
        border-bottom: 1px solid #d7d7d7;
    }
    .menu__link {
        display: block;
        padding: 13px 10px;
        color: #F5675B;
    }
    .header__menu-btn {
        position: relative;
        display: flex;
        justify-content: center;
        align-items: end;
        width: 50px;
        height: 50px;
        padding: 5px;
        cursor: pointer;
    }
    .header__menu-btn span:nth-child(-n+3) {
        position: absolute;
        display: block;
        width: 30px;
        height: 2px;
        background: #F5675B;
    }
    .header__menu-btn span:nth-child(1) {
        top: 10px;
        transition: all .2s ease;
    }
    .header__inner.active .header__menu-btn span:nth-child(1) {
        top: 20px;
        transform: rotate(45deg);
    }
    .header__menu-btn span:nth-child(2) {
        top: 18px;
        transition: opacity .2s ease;
    }
    .header__inner.active .header__menu-btn span:nth-child(2) {
        opacity: 0;
    }
    .header__menu-btn span:nth-child(3) {
        top: 26px;
        transition: all .2s ease;
    }
    .header__inner.active .header__menu-btn span:nth-child(3) {
        top: 20px;
        transform: rotate(-45deg);
    }
    .header__menu-btn span:nth-child(4) {
        font-size: 10px;
        color: #F5675B;
    }
}
!

JS 

              
                // スマホ・タブレットサイズ時のみ表示されるメニューの開閉ボタンを変数に格納。
const spMenuBtn = $("#spMenuBtn");

// メニューや開閉ボタンをラップしている要素を変数に格納。
const headerInner = $("#headerInner");

// 開閉ボタンをクリックすると発火。
spMenuBtn.click(function() {
  // ラップ要素にactiveというクラスを付与する。
  headerInner.toggleClass("active");
});
!
999px

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