<head>
  <link href="https://fonts.googleapis.com/css2?family=Oswald&display=swap" rel="stylesheet">
 <link href="https://fonts.googleapis.com/css2?family=Lato&display=swap" rel="stylesheet">
    <script src="https://kit.fontawesome.com/a076d05399.js"></script>
  </head>

  <body>
    <input type="checkbox" id="active">
    <label for="active" class="menu-btn"><span></span></label>
    <label for="active" class="close"></label>
    <div class="wrapper">
      <ul>
<li><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Services</a></li>
<li><a href="#">Gallery</a></li>
<li><a href="#">Feedback</a></li>
</ul>
</div>
<div class="content">
      <div class="title">
Fullscreen Overlay Navigation Bar</div>
<p>
(Hamburger Menu-2)</p>
</div>
</body>

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Lato', sans-serif;
  font-family: 'Oswald', sans-serif;
}
.wrapper{
  position: fixed;
  top: 0;
  /*left: -100%;*/
  right: -100%;
  height: 100%;
  width: 100%;
  background: #000;
  /*background: linear-gradient(90deg, #f92c78, #4114a1);*/
  /* background: linear-gradient(375deg, #1cc7d0, #2ede98); */
 /* background: linear-gradient(-45deg, #e3eefe 0%, #efddfb 100%);*/
  transition: all 0.6s ease-in-out;
}
#active:checked ~ .wrapper{
  /*left: 0;*/
  right:0;
}
.menu-btn{
  position: absolute;
  z-index: 2;
  right: 20px;
  /*left: 20px; */
  top: 20px;
  height: 50px;
  width: 50px;
  text-align: center;
  line-height: 50px;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  /*color: #fff;*/
  /*background: linear-gradient(90deg, #f92c78, #4114a1);*/
  /* background: linear-gradient(375deg, #1cc7d0, #2ede98); */
 /* background: linear-gradient(-45deg, #e3eefe 0%, #efddfb 100%); */
  transition: all 0.3s ease-in-out;
}
.menu-btn span,
.menu-btn:before,
.menu-btn:after{
  content: "";
  position: absolute;
  top: calc(50% - 1px);
  left: 30%;
  width: 40%;
  border-bottom: 2px solid #000;
  transition: transform .6s cubic-bezier(0.215, 0.61, 0.355, 1);
}
.menu-btn:before{
  transform: translateY(-8px);
}
.menu-btn:after{
  transform: translateY(8px);
}


.close {
  z-index: 1;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transition: background .6s;
}

/* closing animation */
#active:checked + .menu-btn span {
  transform: scaleX(0);
}
#active:checked + .menu-btn:before {
  transform: rotate(45deg);
  border-color: #fff;
}
#active:checked + .menu-btn:after {
  transform: rotate(-45deg);
  border-color: #fff;
}
.wrapper ul{
  position: absolute;
  top: 60%;
  left: 50%;
  height: 90%;
  transform: translate(-50%, -50%);
  list-style: none;
  text-align: center;
}
.wrapper ul li{
  height: 10%;
  margin: 15px 0;
}
.wrapper ul li a{
  text-decoration: none;
  font-size: 30px;
  font-weight: 500;
  padding: 5px 30px;
  color: #fff;
  border-radius: 50px;
  position: absolute;
  line-height: 50px;
  margin: 5px 30px;
  opacity: 0;
  transition: all 0.3s ease;
  transition: transform .6s cubic-bezier(0.215, 0.61, 0.355, 1);
}
.wrapper ul li a:after{
  position: absolute;
  content: "";
  background: #fff;
   /*background: linear-gradient(#14ffe9, #ffeb3b, #ff00e0);*/
  /*background: linear-gradient(375deg, #1cc7d0, #2ede98);*/
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  border-radius: 50px;
  transform: scaleY(0);
  z-index: -1;
  transition: transform 0.3s ease;
}
.wrapper ul li a:hover:after{
  transform: scaleY(1);
}
.wrapper ul li a:hover{
  color: #1a73e8;
}
input[type="checkbox"]{
  display: none;
}
.content{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
  text-align: center;
  width: 100%;
  color: #202020;
}
.content .title{
  font-size: 40px;
  font-weight: 700;
}
.content p{
  font-size: 35px;
  font-weight: 600;
}

#active:checked ~ .wrapper ul li a{
  opacity: 1;
}
.wrapper ul li a{
  transition: opacity 1.2s, transform 1.2s cubic-bezier(0.215, 0.61, 0.355, 1);
  transform: translateX(100px);
}
#active:checked ~ .wrapper ul li a{
  transform: none;
  transition-timing-function: ease, cubic-bezier(.1,1.3,.3,1); /* easeOutBackを緩めた感じ */
   transition-delay: .6s;
  transform: translateX(-100px);
}

External CSS

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External JavaScript

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