CodePen Embed - Pure CSS3 Mega Dropdown Menu With Animation (Vertical)

<div class="container">
<nav>
    <ul class="mcd-menu">
      <li>
        <a href="">
          <i class="fa fa-home"></i>
          <strong>Home</strong>
          <small>sweet home</small>
        </a>
      </li>
      <li>
        <a href="" class="active">
          <i class="fa fa-edit"></i>
          <strong>About us</strong>
          <small>sweet home</small>
        </a>
      </li>
      <li>
        <a href="">
          <i class="fa fa-gift"></i>
          <strong>Features</strong>
          <small>sweet home</small>
        </a>
      </li>
      <li>
        <a href="">
          <i class="fa fa-globe"></i>
          <strong>News</strong>
          <small>sweet home</small>
        </a>
      </li>
      <li>
        <a href="">
          <i class="fa fa-comments-o"></i>
          <strong>Blog</strong>
          <small>what they say</small>
        </a>
        <ul>
          <li><a href="#"><i class="fa fa-globe"></i>Mission</a></li>
          <li>
            <a href="#"><i class="fa fa-group"></i>Our Team</a>
            <ul>
              <li><a href="#"><i class="fa fa-female"></i>Leyla Sparks</a></li>
              <li>
                <a href="#"><i class="fa fa-male"></i>Gleb Ismailov</a>
                <ul>
                  <li><a href="#"><i class="fa fa-leaf"></i>About</a></li>
                  <li><a href="#"><i class="fa fa-tasks"></i>Skills</a></li>
                </ul>
              </li>
              <li><a href="#"><i class="fa fa-female"></i>Viktoria Gibbers</a></li>
            </ul>
          </li>
          <li><a href="#"><i class="fa fa-trophy"></i>Rewards</a></li>
          <li><a href="#"><i class="fa fa-certificate"></i>Certificates</a></li>
        </ul>
      </li>
      <li>
        <a href="">
          <i class="fa fa-picture-o"></i>
          <strong>Portfolio</strong>
          <small>sweet home</small>
        </a>
      </li>
      <li>
        <a href="">
          <i class="fa fa-envelope-o"></i>
          <strong>Contacts</strong>
          <small>drop a line</small>
        </a>
      </li>
      <li class="float">
        <a class="search">
          <input type="text" value="search ...">
          <button><i class="fa fa-search"></i></button>
        </a>
        <a href="" class="search-mobile">
          <i class="fa fa-search"></i>
        </a>
      </li>
    </ul>
  </nav>
</div>

body { 
  background: #EEE; 
  overflow-x:hidden;
}
.clearfix:before,
.clearfix:after {
    content: " ";
    display: table;
}

.clearfix:after {
    clear: both;
}
.clearfix {
    *zoom: 1;
}

.container {
    position: relative;
    margin: 0px auto;
    padding: 50px 0;
    clear: both;
}
@media only screen and (min-width: 1200px) {
    .container {
        width: 1210px;
    }
}

@media only screen and (min-width: 960px) and (max-width: 1199px) {
    .container {
        width: 1030px;
    }
}

@media only screen and (min-width: 768px) and (max-width: 959px) {
    .container {
        width: 682px;
    }
}

@media only screen and (min-width: 480px) and (max-width: 767px) {
    .container {
        width: 428px;
        margin: 0 auto;
    }
}

@media only screen and (max-width: 479px) {
    .container {
        width: 320px;
        margin: 0 auto;
    }
}


  
.mcd-menu {
  list-style: none;
  padding: 0;
  margin: 0;
  background: #FFF;
  /*height: 100px;*/
  border-radius: 2px;
  -moz-border-radius: 2px;
  -webkit-border-radius: 2px;
  
  /* == */
  width: 250px;
  /* == */
}
.mcd-menu li {
  position: relative;
  /*float:left;*/
}
.mcd-menu li a {
  display: block;
  text-decoration: none;
  padding: 12px 20px;
  color: #777;
  /*text-align: center;
  border-right: 1px solid #E7E7E7;*/
  
  /* == */
  text-align: left;
  height: 36px;
  position: relative;
  border-bottom: 1px solid #EEE;
  /* == */
}
.mcd-menu li a i {
  /*display: block;
  font-size: 30px;
  margin-bottom: 10px;*/
  
  /* == */
  float: left;
  font-size: 20px;
  margin: 0 10px 0 0;
  /* == */
  
}
/* == */
.mcd-menu li a p {
  float: left;
  margin: 0 ;
}
/* == */

.mcd-menu li a strong {
  display: block;
  text-transform: uppercase;
}
.mcd-menu li a small {
  display: block;
  font-size: 10px;
}

.mcd-menu li a i, .mcd-menu li a strong, .mcd-menu li a small {
  position: relative;
  
  transition: all 300ms linear;
  -o-transition: all 300ms linear;
  -ms-transition: all 300ms linear;
  -moz-transition: all 300ms linear;
  -webkit-transition: all 300ms linear;
}
.mcd-menu li:hover > a i {
    opacity: 1;
    -webkit-animation: moveFromTop 300ms ease-in-out;
    -moz-animation: moveFromTop 300ms ease-in-out;
    -ms-animation: moveFromTop 300ms ease-in-out;
    -o-animation: moveFromTop 300ms ease-in-out;
    animation: moveFromTop 300ms ease-in-out;
}
.mcd-menu li:hover a strong {
    opacity: 1;
    -webkit-animation: moveFromLeft 300ms ease-in-out;
    -moz-animation: moveFromLeft 300ms ease-in-out;
    -ms-animation: moveFromLeft 300ms ease-in-out;
    -o-animation: moveFromLeft 300ms ease-in-out;
    animation: moveFromLeft 300ms ease-in-out;
}
.mcd-menu li:hover a small {
    opacity: 1;
    -webkit-animation: moveFromRight 300ms ease-in-out;
    -moz-animation: moveFromRight 300ms ease-in-out;
    -ms-animation: moveFromRight 300ms ease-in-out;
    -o-animation: moveFromRight 300ms ease-in-out;
    animation: moveFromRight 300ms ease-in-out;
}

.mcd-menu li:hover > a {
  color: #e67e22;
}
.mcd-menu li a.active {
  position: relative;
  color: #e67e22;
  border:0;
  /*border-top: 4px solid #e67e22;
  border-bottom: 4px solid #e67e22;
  margin-top: -4px;*/
  box-shadow: 0 0 5px #DDD;
  -moz-box-shadow: 0 0 5px #DDD;
  -webkit-box-shadow: 0 0 5px #DDD;
  
  /* == */
  border-left: 4px solid #e67e22;
  border-right: 4px solid #e67e22;
  margin: 0 -4px;
  /* == */
}
.mcd-menu li a.active:before {
  content: "";
  position: absolute;
  /*top: 0;
  left: 45%;
  border-top: 5px solid #e67e22;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;*/
  
  /* == */
  top: 42%;
  left: 0;
  border-left: 5px solid #e67e22;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  /* == */
}

/* == */
.mcd-menu li a.active:after {
  content: "";
  position: absolute;
  top: 42%;
  right: 0;
  border-right: 5px solid #e67e22;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}
/* == */

@-webkit-keyframes moveFromTop {
    from {
        opacity: 0;
        -webkit-transform: translateY(200%);
        -moz-transform: translateY(200%);
        -ms-transform: translateY(200%);
        -o-transform: translateY(200%);
        transform: translateY(200%);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0%);
        -moz-transform: translateY(0%);
        -ms-transform: translateY(0%);
        -o-transform: translateY(0%);
        transform: translateY(0%);
    }
}
@-webkit-keyframes moveFromLeft {
    from {
        opacity: 0;
        -webkit-transform: translateX(200%);
        -moz-transform: translateX(200%);
        -ms-transform: translateX(200%);
        -o-transform: translateX(200%);
        transform: translateX(200%);
    }
    to {
        opacity: 1;
        -webkit-transform: translateX(0%);
        -moz-transform: translateX(0%);
        -ms-transform: translateX(0%);
        -o-transform: translateX(0%);
        transform: translateX(0%);
    }
}
@-webkit-keyframes moveFromRight {
    from {
        opacity: 0;
        -webkit-transform: translateX(-200%);
        -moz-transform: translateX(-200%);
        -ms-transform: translateX(-200%);
        -o-transform: translateX(-200%);
        transform: translateX(-200%);
    }
    to {
        opacity: 1;
        -webkit-transform: translateX(0%);
        -moz-transform: translateX(0%);
        -ms-transform: translateX(0%);
        -o-transform: translateX(0%);
        transform: translateX(0%);
    }
}



.mcd-menu li ul,
.mcd-menu li ul li ul {
  position: absolute;
  height: auto;
  min-width: 200px;
  padding: 0;
  margin: 0;
  background: #FFF;
  /*border-top: 4px solid #e67e22;*/
  opacity: 0;
  visibility: hidden;
  transition: all 300ms linear;
  -o-transition: all 300ms linear;
  -ms-transition: all 300ms linear;
  -moz-transition: all 300ms linear;
  -webkit-transition: all 300ms linear;
  /*top: 130px;*/
  z-index: 1000;
  
  /* == */
  left:280px;
  top: 0px;
  border-left: 4px solid #e67e22;
  /* == */
}
.mcd-menu li ul:before {
  content: "";
  position: absolute;
  /*top: -8px;
  left: 23%;
  border-bottom: 5px solid #e67e22;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;*/
  
  /* == */
  top: 25px;
  left: -9px;
  border-right: 5px solid #e67e22;
  border-bottom: 5px solid transparent;
  border-top: 5px solid transparent;
  /* == */
}
.mcd-menu li:hover > ul,
.mcd-menu li ul li:hover > ul {
  display: block;
  opacity: 1;
  visibility: visible;
  /*top: 100px;*/
  
  /* == */
  left:250px;
  /* == */
}
/*.mcd-menu li ul li {
  float: none;
}*/
.mcd-menu li ul li a {
  padding: 10px;
  text-align: left;
  border: 0;
  border-bottom: 1px solid #EEE;
  
  /* == */
  height: auto;
  /* == */
}
.mcd-menu li ul li a i {
  font-size: 16px;
  display: inline-block;
  margin: 0 10px 0 0;
}
.mcd-menu li ul li ul {
  left: 230px;
  top: 0;
  border: 0;
  border-left: 4px solid #e67e22;
}  
.mcd-menu li ul li ul:before {
  content: "";
  position: absolute;
  top: 15px;
  /*left: -14px;*/
  /* == */
  left: -9px;
  /* == */
  border-right: 5px solid #e67e22;
  border-bottom: 5px solid transparent;
  border-top: 5px solid transparent;
}
.mcd-menu li ul li:hover > ul {
  top: 0px;
  left: 200px;
}



/*.mcd-menu li.float {
  float: right;
}*/
.mcd-menu li a.search {
  /*padding: 29px 20px 30px 10px;*/
  padding: 10px 10px 15px 10px;
  clear: both;
}
.mcd-menu li a.search i {
  margin: 0;
  display: inline-block;
  font-size: 18px;
}
.mcd-menu li a.search input {
  border: 1px solid #EEE;
  padding: 10px;
  background: #FFF;
  outline: none;
  color: #777;
  
  /* == */
  width:170px;
  float:left;
  /* == */
}
.mcd-menu li a.search button {
  border: 1px solid #e67e22;
  /*padding: 10px;*/
  background: #e67e22;
  outline: none;
  color: #FFF;
  margin-left: -4px;
  
  /* == */
  float:left;
  padding: 10px 10px 11px 10px;
  /* == */
}
.mcd-menu li a.search input:focus {
  border: 1px solid #e67e22;
}


.search-mobile { 
  display:none !important;
  background:#e67e22;
  border-left:1px solid #e67e22;
  border-radius:0 3px 3px 0;
}
.search-mobile i { 
  color:#FFF; 
  margin:0 !important;
}


@media only screen and (min-width: 960px) and (max-width: 1199px) {
    .mcd-menu {
    margin-left:10px;
  }
}

@media only screen and (min-width: 768px) and (max-width: 959px) {
    .mcd-menu {
    width: 200px;
  }
  .mcd-menu li a {
    height:30px;
  }
  .mcd-menu li a i {
    font-size: 22px;
  }
  .mcd-menu li a strong {
    font-size: 12px;
  }
  .mcd-menu li a small {
    font-size: 10px;
  } 
  .mcd-menu li a.search input {
    width: 120px;
    font-size: 12px;
  }
  .mcd-menu li a.search buton{
    padding: 8px 10px 9px 10px;
  }
  .mcd-menu li > ul {
    min-width:180px;
  }
  .mcd-menu li:hover > ul {
    min-width:180px;
    left:200px;
  }
  .mcd-menu li ul li > ul, .mcd-menu li ul li ul li > ul {
    min-width:150px;
  }
  .mcd-menu li ul li:hover > ul {
    left:180px;
    min-width:150px;
  }
  .mcd-menu li ul li ul li:hover > ul {
    left:150px;
    min-width:150px;
  }
  .mcd-menu li ul a {
    font-size:12px;
  }
  .mcd-menu li ul a i {
    font-size:14px;
  }
}

@media only screen and (min-width: 480px) and (max-width: 767px) {
  
  .mcd-menu { 
    width: 50px;
  }
  .mcd-menu li a { 
    position: relative;
    padding: 12px 16px;
    height:20px;
  }
  .mcd-menu li a small { 
    display: none;
  }
  .mcd-menu li a strong { 
    display: none;
  }
  .mcd-menu li a:hover strong,.mcd-menu li a.active strong {
    display:block;
    font-size:10px;
    padding:3px 0;
    position:absolute;
    bottom:0px;
    left:0;
    background:#e67e22;
    color:#FFF;
    min-width:100%;
    text-transform:lowercase;
    font-weight:normal;
    text-align:center;
  }
  .mcd-menu li .search { 
    display: none;
  }
  
  .mcd-menu li > ul {
    min-width:180px;
    left:70px;
  }
  .mcd-menu li:hover > ul {
    min-width:180px;
    left:50px;
  }
  .mcd-menu li ul li > ul, .mcd-menu li ul li ul li > ul {
    min-width:150px;
  }
  .mcd-menu li ul li:hover > ul {
    left:180px;
    min-width:150px;
  }
  .mcd-menu li ul li ul li > ul {
    left:35px;
    top: 45px;
    border:0;
    border-top:4px solid #e67e22;
  }
  .mcd-menu li ul li ul li > ul:before {
    left:30px;
    top: -9px;
    border:0;
    border-bottom:5px solid #e67e22;
    border-left:5px solid transparent;
    border-right:5px solid transparent;
  }
  .mcd-menu li ul li ul li:hover > ul {
    left:30px;
    min-width:150px;
    top: 35px;
  }
  .mcd-menu li ul a {
    font-size:12px;
  }
  .mcd-menu li ul a i {
    font-size:14px;
  }
  
}

@media only screen and (max-width: 479px) {
    .mcd-menu { 
    width: 50px;
  }
  .mcd-menu li a { 
    position: relative;
    padding: 12px 16px;
    height:20px;
  }
  .mcd-menu li a small { 
    display: none;
  }
  .mcd-menu li a strong { 
    display: none;
  }
  .mcd-menu li a:hover strong,.mcd-menu li a.active strong {
    display:block;
    font-size:10px;
    padding:3px 0;
    position:absolute;
    bottom:0px;
    left:0;
    background:#e67e22;
    color:#FFF;
    min-width:100%;
    text-transform:lowercase;
    font-weight:normal;
    text-align:center;
  }
  .mcd-menu li .search { 
    display: none;
  }
  
  .mcd-menu li > ul {
    min-width:180px;
    left:70px;
  }
  .mcd-menu li:hover > ul {
    min-width:180px;
    left:50px;
  }
  .mcd-menu li ul li > ul, .mcd-menu li ul li ul li > ul {
    min-width:150px;
  }
  .mcd-menu li ul li:hover > ul {
    left:180px;
    min-width:150px;
  }
  .mcd-menu li ul li ul li > ul {
    left:35px;
    top: 45px;
    border:0;
    border-top:4px solid #e67e22;
  }
  .mcd-menu li ul li ul li > ul:before {
    left:30px;
    top: -9px;
    border:0;
    border-bottom:5px solid #e67e22;
    border-left:5px solid transparent;
    border-right:5px solid transparent;
  }
  .mcd-menu li ul li ul li:hover > ul {
    left:30px;
    min-width:150px;
    top: 35px;
  }
  .mcd-menu li ul a {
    font-size:12px;
  }
  .mcd-menu li ul a i {
    font-size:14px;
  }
    
}

This Pen is owned by Rizky Kurniawan Ritonga on CodePen.

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