响应式全屏菜单

Html

<header id="header">
  <nav class="nav">
    <button class="toggle-menu">
      <span></span>
    </button>
  </nav>
</header>
<div id="menu" class="">
  <nav class="main-nav">
    <ul>
      <li><a href="#">About</a></li>
      <li><a href="#">Case</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>
</div>

CSS

body {
    font-family:Helvetica, Arial, sans-serif;
    background-color: #000000;
    padding: 0px;
    margin: 0px;
}
    
@-webkit-keyframes fadeInUp {
  from {
    opacity: 0;
    -webkit-transform: translate3d(0, 100%, 0);
    transform: translate3d(0, 100%, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: none;
    transform: none;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    -webkit-transform: translate3d(0, 100%, 0);
    transform: translate3d(0, 100%, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: none;
    transform: none;
  }
}

@keyframes fadeInDown {
  from {
    opacity: 1;
    -webkit-transform: none;
    transform: none;
  }

  to {
    opacity: 0;
    -webkit-transform: translate3d(0, 100%, 0);
    transform: translate3d(0, 100%, 0);
  }
}    
    
.fadeInUp {
  -webkit-animation-name: fadeInUp;
  animation-name: fadeInUp;
}
.fadeInDown {
  -webkit-animation-name: fadeInDown;
  animation-name: fadeInDown;
}
    
#header {
  padding: 2rem;
}

#menu {
  background: #0b4fbe;
  height: 100%;
  left: 0;
  opacity: 0;
  overflow: hidden;
  position: fixed;
  text-align: center;
  top: 0;
  -webkit-transition: all 0.7s ease-in-out;
  transition: all 0.7s ease-in-out;
  visibility: hidden;
  width: 100%;
  z-index: 100;
}
#menu.open {
  opacity: 1;
  visibility: visible;
}
#menu.open li:nth-child(1) {
  -webkit-animation-delay: 0.1s;
          animation-delay: 0.1s;
}
#menu.open li:nth-child(2) {
  -webkit-animation-delay: 0.2s;
          animation-delay: 0.2s;
}
#menu.open li:nth-child(3) {
  -webkit-animation-delay: 0.3s;
          animation-delay: 0.3s;
}

#menu.open li {
  -webkit-animation-duration: 1.0s;
          animation-duration: 1.0s;
  -webkit-animation-fill-mode: both;
          animation-fill-mode: both;
  -webkit-animation-name: fadeInUp;
          animation-name: fadeInUp;
}
    
#menu li {
  -webkit-animation-duration: 1.0s;
          animation-duration: 1.0s;
  -webkit-animation-fill-mode: both;
          animation-fill-mode: both;
  -webkit-animation-name: fadeInDown;
          animation-name: fadeInDown;
}
#menu li:nth-child(1) {
  -webkit-animation-delay: 0.3s;
          animation-delay: 0.3s;
}
#menu li:nth-child(2) {
  -webkit-animation-delay: 0.2s;
          animation-delay: 0.2s;
}
#menu li:nth-child(3) {
  -webkit-animation-delay: 0.1s;
          animation-delay: 0.1s;
}

#menu ul:hover a {
  opacity: 0.5;
}
#menu ul a {
  -webkit-transform: translateZ(0);
  -webkit-transition: opacity 0.3s ease-in-out;
  transition: opacity 0.3s ease-in-out;
}
#menu ul a:hover {
  opacity: 1;
}
#menu .main-nav {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
          transform: translateY(-50%);
}
#menu .main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
#menu .main-nav a {
  color: #ffffff;
  display: block;
  font-size: 2.5rem;
  font-weight: bold;
  padding: 1rem 1rem;
  text-decoration: none;
  text-transform: uppercase;
}
#menu .main-nav a:first {
  padding-top: 0;
}


.toggle-menu {
  background-color: transparent;
  border: none;
  cursor: pointer;
  display: inline-block;
  float: right;
  height: 60px;
  outline: none;
  padding: 0;
  pointer-events: initial;
  position: relative;
  vertical-align: middle;
  width: 60px;
  z-index: 200;
}
.toggle-menu span {
  background-color: #fff;
  content: "";
  display: block;
  height: 6px;
  left: 0px;
  position: absolute;
  top: calc(50% - 1px );
  -webkit-transform-origin: 50% 50%;
          transform-origin: 50% 50%;
  -webkit-transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  -webkit-transform 0.2s linear;
  transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  -webkit-transform 0.2s linear;
  transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  transform 0.2s linear;
  transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  transform 0.2s linear, -webkit-transform 0.2s linear;
  border-radius: 6px;
  width: 60px;
}
.toggle-menu span:before, .toggle-menu span:after {
  background-color: #fff;
  content: "";
  display: block;
  height: 6px;
  position: absolute;
  border-radius: 6px;
  -webkit-transform-origin: 50% 50%;
          transform-origin: 50% 50%;
  -webkit-transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  -webkit-transform 0.2s linear;
  transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  -webkit-transform 0.2s linear;
  transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  transform 0.2s linear;
  transition: background-color 0.2s ease-in-out, top 0.2s 0.2s ease-out,  transform 0.2s linear, -webkit-transform 0.2s linear;
  width: 60px;
}
.toggle-menu span:before {
  top: 16px;
}
.toggle-menu span:after {
  top: -16px;
}
.toggle-menu.active span {
  background-color: transparent;
  -webkit-transition: background 0.2s ease-out;
  transition: background 0.2s ease-out;
}
.toggle-menu.active span:before, .toggle-menu.active span:after {
  -webkit-transition: top 0.2s ease-out, -webkit-transform 0.2s 0.2s ease-out;
  transition: top 0.2s ease-out, -webkit-transform 0.2s 0.2s ease-out;
  transition: top 0.2s ease-out, transform 0.2s 0.2s ease-out;
  transition: top 0.2s ease-out, transform 0.2s 0.2s ease-out, -webkit-transform 0.2s 0.2s ease-out;
}
.toggle-menu.active span:before {
  top: 0;
  -webkit-transform: rotate3d(0, 0, 1, -45deg);
          transform: rotate3d(0, 0, 1, -45deg);
}
.toggle-menu.active span:after {
  top: 0;
  -webkit-transform: rotate3d(0, 0, 1, 45deg);
          transform: rotate3d(0, 0, 1, 45deg);
}

Js

$('.toggle-menu').click (function(){
  $(this).toggleClass('active');
  $('#menu').toggleClass('open');
});