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CSS

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JavaScript

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HTML 

              
                <div class="openbtn4"><span></span><span></span><span></span></div>

<!--必須 jQueryではnavでは動作しなかったためクラス名をつけた-->
<nav class="navi">
  <ul>
    <li>Top</li>
    <li>Company</li>
    <li>Servise</li>
    <li>Cobtact</li>
  </ul>
</nav>
!

CSS 

              
                /*==================================================
　nav
===================================*/
/*必須 jQueryではnavでは動作しなかったためクラス名をつけた*/
.navi{
  background:#0bd;
  /* position:absolute だと右側にブラウザを超えて余白ができてしまう*/
  position: fixed;
  z-index:9980;
  top:-120%;
  right: 0;
  height:100vh;
  width:100%;
  transition: .5s;
}

.navi.open{
   top:0;
}

/*-------その他---------*/

/*ulの余分な余白削除↓これはcodepenの余白*/
ul{
  padding-inline-start: 0px;
}

li{
  list-style:none;
  padding:15px;
  font-size:18px;
  border-bottom:1px dotted #000;
  box-sizing: border-box;
}

/*==================================================
ボタンのみ 
引用元：https://coco-factory.jp/ugokuweb/move01-cat/humbugermenu/
===================================*/

/*ボタン外側※レイアウトによってpositionや形状は適宜変更してください*/
.openbtn4{
  position: relative;/*ボタン内側の基点となるためrelativeを指定*/
  position: absolute;
  background:#D54884;
  cursor: pointer;
  width: 50px;
  height:50px;
  border-radius: 5px;
  right:5px;
  z-index:9999;
}

/*ボタン内側*/
.openbtn4 span{
    display: inline-block;
    transition: all .4s;/*アニメーションの設定*/
    position: absolute;
    left: 14px;
    height: 2px;
    border-radius: 5px;
  background: #fff;
    width: 45%;
  }


.openbtn4 span:nth-of-type(1) {
  top:13px; 
}

.openbtn4 span:nth-of-type(2) {
  top:19px;
}

.openbtn4 span:nth-of-type(3) {
  top:25px;
}

.openbtn4 span:nth-of-type(3)::after {
  content:"Menu";/*3つ目の要素のafterにMenu表示を指定*/
  position: absolute;
  top:5px;
  left:-2px;
  color: #fff;
  font-size: 0.6rem;
  text-transform: uppercase;
}

/*activeクラスが付与されると線が回転して×になり、Menu⇒Closeに変更*/

.openbtn4.active span:nth-of-type(1) {
    top: 14px;
    left: 18px;
    transform: translateY(6px) rotate(-45deg);
    width: 30%;
}

.openbtn4.active span:nth-of-type(2) {
  opacity: 0;
}

.openbtn4.active span:nth-of-type(3){
    top: 26px;
    left: 18px;
    transform: translateY(-6px) rotate(45deg);
    width: 30%;
}

.openbtn4.active span:nth-of-type(3)::after {
  content:"Close";/*3つ目の要素のafterにClose表示を指定*/
    transform: translateY(0) rotate(-45deg);
  top:5px;
  left:4px;
}
!

JS 

              
                //jQueryで実装
$(".openbtn4").click(function () {
    $(this).toggleClass('active');
    $(".navi").toggleClass('open');
});

//javascriptで実装
//const btn = document.querySelector('.openbtn4');
//const nav = document.querySelector('.navi');
 
//btn.addEventListener('click' , () =>{
//btn.classList.toggle('active');
//nav.classList.toggle('open')
//});
!
999px

Console