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HTML 

              
                <div class="mobile-nav">

    <div class="b-nav">
          <ul>
              <li><a class="b-link b-link--active" href="#">Item 1</a></li>
              <li><a class="b-link" href="#">Item 2</a></li>
              <li><a class="b-link" href="#">Item 3</a></li>
              <li><a class="b-link" href="#">Item 4</a></li>
              

        </ul>

          <input type="text" class="mobile-search" placeholder="Enter keyword" name="">
          <input type="submit" class="mobile-search-btn" value="Search">

    </div>

        <!-- Burger-Icon -->
        <div class="b-container">
          <div class="b-menu">
            <div class="b-bun b-bun--top"></div>
            <div class="b-bun b-bun--mid"></div>
            <div class="b-bun b-bun--bottom"></div>
          </div>

          <!-- Burger-Brand -->
          <a href="#" class="b-brand"></a>
        </div>

  </div>
!

CSS 

              
                
body {
    background-color: #323a59;
    overflow:hidden;
}
body.open, body:after {
  overflow: hidden
}
.b-nav, body:after {
  position: absolute;
  right: 0;
}
.b-brand, .b-link {
  font-size: 18px;
  font-weight: 700;
  margin-left: 0;
  text-decoration: none;
  font-family: "Roboto Slab", serif;
  text-transform: uppercase;
  ;
}
@-webkit-keyframes slideInLeft {
  0% {
    -webkit-transform: translate3d(345px, 0, 0);
    transform: translate3d(345px, 0, 0);
    visibility: visible;
  }
  100% {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    visibility: visible;
  }
}
@keyframes slideInLeft {
  0% {
    -webkit-transform: translate3d(345px, 0, 0);
    transform: translate3d(345px, 0, 0);
    visibility: visible;
  }
  100% {
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    visibility: visible;
  }
}
* {
  box-sizing: border-box
}
body:after {
  background: #000;
  content: '';
  height: 100%;
  left: 0;
  opacity: 0;
  padding: 0;
  top: 0;
  visibility: hidden;
  -webkit-transition: all .6s ease;
  transition: all .6s ease;
  width: 100%;
}
body.open:after {
  z-index: 10;
  opacity: 0.65;
  height: 100000%;
  visibility: visible
}
.b-nav {
  background: #000 none repeat scroll 0 0;
  position: absolute;
  top: 0;
  width: 320px;
  z-index: 12;
}
.b-nav:not(.open) {
  animation-duration: 0.4s;
  animation-fill-mode: both;
  -webkit-animation-name: slideOutLeft;
  animation-name: slideOutLeft
}
.b-nav {
  animation-duration: .4s;
  animation-fill-mode: both;
  -webkit-animation-name: slideInLeft;
  animation-name: slideInLeft
}
.b-nav ul {
  padding-left: 0px;
}
.b-nav li {
  color: #fff;
  list-style-type: none;
  padding: 10px 10px 10px 0;
  text-align: left;
  -webkit-transform: translateX(345px);
  -ms-transform: translateX(345px);
  transform: translateX(345px)
}
.b-nav li:not(.open) {
  animation-duration: 0.4s;
  animation-fill-mode: both;
  -webkit-animation-name: slideOutLeft;
  animation-name: slideOutLeft
}
.b-nav li:not(.open), .b-nav.open li {
  -webkit-animation-duration: 0.4s;
  -webkit-animation-fill-mode: both
}
.b-nav li:first-child {
  margin-top: 0px
}
.b-nav.open {
  visibility: visible;
  animation-duration: 0.4s;
  animation-fill-mode: both;
  -webkit-animation-name: slideInLeft;
  animation-name: slideInLeft;
}
.b-nav:not(.open) {
  visibility: hidden;
  animation-duration: 0.4s;
  animation-fill-mode: backwards;
  -webkit-animation-name: slideOutLeft;
  animation-name: slideOutLeft
}
.b-nav.open li {
  padding-left: 30px;
  animation-duration: 0.2s;
  animation-fill-mode: both;
  -webkit-animation-name: slideInLeft;
  animation-name: slideInLeft
}
.b-link {
  background: 0 0;
  border-left: rgba(255, 255, 255, 0)solid 2px;
  color: #fff;
  transition: all .4s ease;
  width: auto
}
.b-link, .b-menu {
  -webkit-transition: all .4s ease;
}
.b-nav li {
  border-left: 5px solid #e00a12;
}

/*.b-link--active,
.b-link:hover {
    border-left: #e00a12 solid 5px;
    padding-left: 30px
}*/

.b-menu {
  cursor: pointer;
  display: block;
  height: 66px;
  padding-top: 20px;
  position: relative;
  top: -20px;
  transition: all 0.4s ease 0s;
  width: 43px;
  z-index: 12;
  right: 10px;
}
.b-bun--bottom, .b-bun--mid, .b-bun--top {
  height: 2px;
  width: 25px
}
.b-container.open .b-main, .b-menu:hover {}
.b-bun {
  background: #fff;
  transition: all .4s ease
}
.b-brand, .b-bun {
  position: relative;
  -webkit-transition: all .4s ease
}
.b-bun--top {
  top: 0
}
.b-bun--mid {
  top: 8px
}
.b-bun--bottom {
  top: 16px
}
.b-brand {
  color: #2196f3;
  top: -21.43px;
  transition: all .4s ease;
  z-index: 13
}
.b-container {
  position: absolute;
  right: 0;
  top: 20px;
}
.b-container:hover:not(.open) .bun-bottom, .b-container:hover:not(.open) .bun-mid, .b-container:hover:not(.open) .bun-top {
  background: #2196f3
}
.b-container.open .b-bun--top {
  background: #e00a12;
  top: 9px;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg)
}
.b-container.open .b-bun--mid {
  opacity: 0
}
.b-container.open .b-bun--bottom {
  background: #e00a12;
  top: 5px;
  -webkit-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  transform: rotate(-45deg)
}
.b-container.open .b-brand {
  color: #fff
}
.mobile-search-btn {
     background-color: #e00a12;
    border-radius: 4px;
    color: #fff;
    margin-bottom: 25px;
    margin-left: 30px;
    padding: 10px 20px;
    text-transform: uppercase;
  border:none;
}
.mobile-search {
    background: transparent none repeat scroll 0 0;
    border: 1px solid #fff;
    color: #949494;
    font-size: 14px;
    margin-bottom: 20px;
    margin-left: 30px;
    padding: 10px;
    width: 80%;
}
!

JS 

              
                
/********************** Mobile Menu ***********************/
'use strict';

(function() {
  var body = document.body;
  var burgerMenu = document.getElementsByClassName('b-menu')[0];
  var burgerContain = document.getElementsByClassName('b-container')[0];
  var burgerNav = document.getElementsByClassName('b-nav')[0];

  burgerMenu.addEventListener('click', function toggleClasses() {
    [body, burgerContain, burgerNav].forEach(function (el) {
      el.classList.toggle('open');
    });
  }, false);
})();


/********************** Mobile Menu ***********************/
!
999px

Console