<body>
   <aside>
     <header><span class="ico">
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     </span>
     </header>
     <nav>
       <ul class="main-menu">
         <li><a href="#"><span class="ico">          

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         </span><span>Overview <button>+</button></span></a></li>
         <li><a href="#"><span class="ico">

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         </span><span>Location <button>+</button></span>
           </a></li>
         <li><a href="#"><span class="ico">

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<g>
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  <g>
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         </span><span>Live View <button>+</button></span></a></li>
         <li><a href="#"><span class="ico">
           
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<g>
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         </span><span>Traffic <button>+</button></span></a></li>
         <li><a href="#"><span class="ico ico-heart">
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         </span><span>Demography <button>+</button></span></a></li>
       </ul>
     </nav>
   </aside>
</body>
@import url(https://fonts.googleapis.com/css?family=PT+Sans:400,700)

$dark: #16191f
$light: #383e49
$lighter: #4c515d
$border: #232831
$font: #cfd2d9

body
  background: $dark
  padding: 50px 0
  font-size: 13px
  font-weight: 400
  font-family: Tahoma "PT Sans" sans-serif

  aside
    width: 50px
    min-height: 400px
    background: $light
    border-radius: 5px
    text-align: center
    overflow: hidden
    transition: all .2s ease-in
    margin: 0 auto
 
    
    &:hover
      width: 200px
      transition: all .3s ease-in
        

    
    header
      height: 60px
      background: $lighter
      text-align: center
      border-bottom: 1px solid $border
      box-shadow: 0 1px 1px 0 rgba(053, 059, 069, 1)
      
      .ico
        display: inline-block
        margin-top: 15px
        
    nav
      
      ul
        list-style: none
        margin: 0
        padding: 0
        
        li
          height: 50px
          display: block
          border-bottom: 1px solid $border
          line-height: 50px
          position: relative

          a
            width: 200px
            color: #fff
            text-decoration: none
            display: block
            position: relative
            color: $font
            border-left: 2px solid transparent
            transition: all .2s ease-in
              
            button
              width: 20px
              height: 20px
              background: none
              border: none
              font-weight: bold
              font-size: 15px
              color: #fff568
              transform: rotate(0deg)
              transition: all .3s ease-in
              position: absolute
              left: 95px
              top: 15px
              outline: none
              text-align: center
              line-height: 20px
              padding: 0
              
              &:hover
                transform: rotate(135deg)
                transition: all .2s ease-in
                color: #cfd2d9
                
            
            &:after
              content: " "
              display: block
              clear: both
              visibility: hidden
              line-height: 0
              height: 0
              
            &:hover
              background: $lighter
              color: #fff
              border-left: 2px solid #cfd2d9
              transition: all .2s ease-in
              
              .ico
                svg
                  path
                    stroke: #fff
              
            span
              display: block
              float: left
              white-space: nowrap
                                      
            .ico
              width: 50px
              height: 50px
              border-right: 1px solid $border
              text-align: center
              position: relative
             
              svg
                height: 20px
                width: 1000px
                position: absolute
                top: 50%
                left: 50%
                margin-top: -10px
                margin-left: -12px
                            
                path
                  stroke: #cfd2d9
                  stroke-width: 3
                  fill: #cfd2d9
                
                rect
                  @extend path
              
              + span
                position: absolute
                left: 70px
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External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

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