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HTML

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CSS

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JavaScript

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HTML 

              
                #wrapper
  header.head
    .logo takblog
  #memubtn.memubtn
  nav.nav#nav
    .nav-inner
      ul.glnav
        li.glnav-item
          a(href="#") HOME
        li.glnav-item
          a(href="#") ABOUT
        li.glnav-item
          a(href="#") PRODUCTS
        li.glnav-item
          a(href="#") NEWS
        li.glnav-item
          a(href="#") IR
        li.glnav-item
          a(href="#") CONTACT
  main.main
    .kv
      img(src="https://takblog.site/wp-content/uploads/2019/08/javascript3-1.jpg", alt="")
    p ダミーテキストダミーテキストダミーテキストダミーテキストダミーテキストダミーテキストダミーテキストダミーテキストダミーテキストダミーテキストダミーテキストダミーテキスト
!

CSS 

              
                // ---------------------------
// 大事な変数定義
// ---------------------------
$openClass:navOpen;
$nav_z-index:100;
$ease-time:.3s;

// ---------------------------
// 大事なstyle
// ---------------------------
#wrapper{
  // メニューオープン時の各style
  &.#{$openClass}{
    // メニューオープン時にコンテンツエリアがスクロールしないように position: fixed;
    position: fixed;
    left: 0;
    width: 100%;
    height: 100%;
    .nav{
      transform:translateY(0);
    }
    .memubtn{
      &:before{
        content:'close';
        color:#fff;
      }
    }
  }
}
.nav{
  position:fixed;
  z-index: $nav_z-index;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  // スマホでのスクロールを滑らかにするためのstyle
  -webkit-overflow-scrolling: touch;
  overflow-scrolling: touch;
  overflow-y: auto;  
  transform: translateY(-100%); // ここはお好みで
  transition: $ease-time transform ease; // ここはお好みで  
  &-inner{
    -webkit-overflow-scrolling: touch;
    overflow-scrolling: touch;
    overflow-y:auto;
  }
}

// 今回はgooleのMaterial iconsを使用してmenubtnを作成
.memubtn{
  display: block;
  position:fixed;
  right: 15px;
  top: 10px;
  z-index: #{$nav_z-index+1};  //navのz-indexより大きく
  color:#000;
  &:before{
    content:'menu';
    font-family: 'Material Icons';
    font-size: 40px;
  }
}

// ---------------------------
// デザイン調整のためのstyle
// ---------------------------
img{
  width: 100%;
}
.head{
  height: 80px;
  .logo{
    text-align: center;
    height: 80px;
    line-height: 80px;
    font-size: 30px;
  }
}
.main{
  display: block;
  max-width:1230px;
  padding-left: 15px;
  padding-right: 15px;
  margin: 0 auto;
}

.nav{
  background-color: rgba(0,0,0,.8);
  &-inner{
    padding:40px 15px;
  }
}
.glnav{
  &-item{
    text-align: center;
    padding: 20px 0;
    a{
      color:#fff;
      font-size: 20px;      
    }
  }
}
!

JS 

              
                // 変数定義 -------------------------
const memubtn = document.getElementById('memubtn');  // メニュー開閉のボタン
const wrapper = document.getElementById('wrapper'); // ページ全体を囲む要素 wrapper
const nav = document.getElementById('nav');         // ドロワーメニュー要素 nav
const openClass = 'navOpen';                        // メニューオープン時に wrapper につくclass
let navopen = false;                                // メニューオープンの判定

// 関数定義 -------------------------
const navToggle = () =>{
  if( navopen ){
    navClose();
  }else{
    navOpen();
  }
}

// メニューオープン時の関数
const navOpen = () =>{
  navopen = true;
  const top = window.pageYOffset;
  wrapper.setAttribute('style',`top:-${top}px`);
  wrapper.classList.add(openClass);
}

// メニュークローズ時の関数
const navClose = () =>{
  const closeFirst = (callback)=>{
    navopen = false;
    let scrolltop = wrapper.style.top;
    scrolltop = scrolltop.slice(1,-2);
    wrapper.style.top = "";
    wrapper.classList.remove(openClass);
    callback(scrolltop);
  }
  closeFirst((scrolltop)=>{
    window.scrollTo(0, scrolltop);
  });
}


// 関数実行 -------------------------
if( memubtn != null){
  memubtn.addEventListener('click', navToggle, false);
}
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999px

Console