Pure CSS Fly In Sidebar Nav multi level

index.html

<section class="app">
  <aside class="sidebar">
    <nav class="sidebar-nav">
      <ul>
        <li>
          <a href="#"><i class="ion-bag"></i> <span>Bags</span></a>
          <ul class="nav-flyout">
            <li>
              <a href="#"><i class="ion-bag"></i> <span>Handbags</span></a>
              <ul class="nav-flyout-2">
                <li>
                  <a href="#"><i class="ion-ios-color-filter-outline"></i>Women</a>
                </li>
                <li>
                  <a href="#"><i class="ion-ios-clock-outline"></i>Men</a>
                </li>
                <li>
                  <a href="#"><i class="ion-android-star-outline"></i>Unisex</a>
                </li>
              </ul>
            </li>
            <li>
              <a href="#"><i class="ion-android-star-outline"></i>Luggage</a>
              <ul class="nav-flyout-2">
                <li>
                  <a href="#"><i class="ion-ios-color-filter-outline"></i>id2</a>
                </li>
                <li>
                  <a href="#"><i class="ion-ios-clock-outline"></i>id3</a>
                </li>
                <li>
                  <a href="#"><i class="ion-android-star-outline"></i>id4</a>
                </li>
                <li>
                  <a href="#"><i class="ion-heart-broken"></i>id5</a>
                </li>
              </ul>
            </li>
            <li>
              <a href="#"><i class="ion-heart-broken"></i>Informações de Gestão</a>
            </li>
          </ul>
        </li>
        <li>
          <a href="#"><i class="ion-ios-settings"></i> <span class="">Controls</span></a>
          <ul class="nav-flyout">
            <li>
              <a href="#"><i class="ion-ios-alarm-outline"></i>Watch</a>
            </li>
            <li>
              <a href="#"><i class="ion-ios-camera-outline"></i>Creeper</a>
            </li>
            <li>
              <a href="#"><i class="ion-ios-chatboxes-outline"></i>Hate</a>
            </li>
            <li>
              <a href="#"><i class="ion-ios-cog-outline"></i>Grinder</a>
            </li>
          </ul>
        </li>
        <li>
          <a href="#"><i class="ion-ios-medical-outline"></i> <span class="">cocaine</span></a>
          <ul class="nav-flyout">
            <li>
              <a href="#"><i class="ion-ios-alarm-outline"></i>Watch</a>
            </li>
            <li>
              <a href="#"><i class="ion-ios-camera-outline"></i>Creeper</a>
            </li>
            <li>
              <a href="#"><i class="ion-ios-chatboxes-outline"></i>Hate</a>
            </li>
            <li>
              <a href="#"><i class="ion-ios-cog-outline"></i>Grinder</a>
            </li>
          </ul>
        </li>
        <li>
          <a href="#"><i class="ion-bag"></i> <span>Identificação</span></a>
          <ul class="nav-flyout">
            <li>
              <a href="#"><i class="ion-bag"></i> <span>Informações territoriais</span></a>
              <ul class="nav-flyout-2">
                <li>
                  <a href="#"><i class="ion-ios-color-filter-outline"></i>id2</a>
                </li>
                <li>
                  <a href="#"><i class="ion-ios-clock-outline"></i>id3</a>
                </li>
                <li>
                  <a href="#"><i class="ion-android-star-outline"></i>id4</a>
                </li>
                <li>
                  <a href="#"><i class="ion-heart-broken"></i>id5</a>
                </li>
              </ul>
            </li>
            <li>
              <a href="#"><i class="ion-android-star-outline"></i>Secretaria de Saúde</a>
              <ul class="nav-flyout-2">
                <li>
                  <a href="#"><i class="ion-ios-color-filter-outline"></i>id2</a>
                </li>
                <li>
                  <a href="#"><i class="ion-ios-clock-outline"></i>id3</a>
                </li>
                <li>
                  <a href="#"><i class="ion-android-star-outline"></i>id4</a>
                </li>
                <li>
                  <a href="#"><i class="ion-heart-broken"></i>id5</a>
                </li>
              </ul>
            </li>
            <li>
              <a href="#"><i class="ion-heart-broken"></i>Informações de Gestão</a>
            </li>
          </ul>
        </li>
      </ul>
    </nav>
  </aside>
</section>

pure-css-fly-in-sidebar-nav-multi-level.markdown

Pure CSS Fly In Sidebar Nav multi level

A simple, multi-level sidebar nav. Features pure css "fly in" subnav, that leaves icons of parent nav visible. Nav items will scroll (overflow-y) if needed. Uses transforms and transitions.

A Pen by Guilherme Maciel on CodePen.

License.

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

style.scss

@import "bourbon";
@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,300,600);

body{
  font-family: "Lato";
  font-size: 100%; 
	overflow-y: scroll; 
 font-family: sans-serif; 
 -ms-text-size-adjust: 100%; 
 -webkit-text-size-adjust: 100%; 
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale; 
  text-rendering: optimizeLegibility;
  background-color: #fefefe;
}
a{
  text-decoration: none;
  @include transition(all 0.6s ease);
  
  &:hover{
     @include transition(all 0.6s ease);
  }
}

.app{
  height: 100vh;
}
/* -------------
Sidebar
----------------*/
.sidebar {
  position: absolute;
  //width: 33.3333%;
  width: 25em;
  height: 100%;
  top: 0;
  overflow:hidden;
  background-color: #19222a;
  -webkit-transform: translateZ(0);
  visibility: visible;
  -webkit-backface-visibility: hidden;
  
  header{
    background-color: #09f;
    width: 100%;
    display:block;
    padding: 1em;
  }
}

/* -------------
Sidebar Nav
----------------*/
.sidebar-nav {
  position: fixed;
  //width: 13em;
  background-color: #19222a;
  height: 100%;
  font-weight: 400; 
  font-size: 1.2em;
  overflow: auto;
  padding-bottom: 6em;
  z-index: 9;
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
 
  
  ul{
    list-style:none;
    display: block;
    padding: 0;
    margin: 0;
    
    li{
      margin-left: 0;
      padding-left: 0;
      //min-width: 13em;
      display:inline-block;
      width: 100%;
      height: 3em;
      
      a{
        color: rgba(255,255,255,0.9);
        font-size: 0.75em;
        padding: 1.05em	1em;
        position: relative;
        display:block;
        
        &:hover{
          background-color: rgba(0,0,0,0.9);
          @include transition(all 0.6s ease);
        }
      }
/* -------------
Sidebar: icons
----------------*/
      i{
        font-size: 1.8em;
        padding-right: 0.5em;
        display: inline;
        vertical-align:middle;
      }  
    }
  }

/* -------------
Chev elements
----------------*/ 
  & > ul > li > a:after, & > ul > li > ul > li > a:after{
    content: '\f125';
    font-family: ionicons;
    font-size: 0.5em;
    width: 10px;
    color: #fff;
    position: absolute;
    right: 2em;
    top: 45%;
  }

/* -------------
Nav-Flyout
----------------*/
  & .nav-flyout {
    position: absolute;
    background-color: #0F161D;
    z-index: 9;
    left: 2.5em;
    top: 1;
    height: 100vh;
    @include transform(translateX(100%));
    @include transition(all 0.5s ease);
    
    a:hover{
      background-color: #09f;
    }
  }
  
  & .nav-flyout-2 {
    position: absolute;
    background-color: #080D11;
    z-index: 9;
    left: 2.5em;
    top: 1;
    height: 100vh;
    @include transform(translateX(100%));
    @include transition(all 0.5s ease);
    
    a:hover{
      background-color: #09f
    }
  }

/* -------------Hover----------------*/
  & ul > li:hover{
      .nav-flyout{
      @include transform(translateX(0));
        @include transition(all 0.5s ease);
    }
      & ul > li:hover{
        .nav-flyout-2{
        @include transform(translateX(0));
          @include transition(all 0.5s ease);
      }
    }
  }
  

}

.sidebar-nav ul li:hover > a, .sidebar-nav ul li a.hover{
    background-color: #09f;
    color: #000;
}