Vulcan/packages/telescope-menu/lib/stylesheets/_dropdown.scss

.menu-dropdown{

  // menu

  text-align: left;
  position:relative;
  
  // indicator for menu with items

  &.menu-has-items{
    .menu-label-wrapper{
      cursor: pointer;
      .menu-label{
        font-weight: normal;
      }
      &:after{
        display:inline-block;
        position:relative;
        top:-1px;
        margin-left:4px;
        content:"▼";
        font-size:8px;
      }
    }
  }

  // hover state

  &:hover{

    // show menu items
    .menu-items{
      display:block;
    }

    // add special pseudo-element to preserve hover continuity between menu label and menu items
    .menu-label{
      &:after{
        content: " ";
        display: block;
        position: absolute;
        top: 10px;
        width: 100%;
        height: 20px;
      }
    }
  }

  // dropdown style

  .menu-items, .menu-child-items{
    display:none; // hidden until user hovers
    top:30px;
    left:0px;
    position:absolute;
    z-index: 10000;
    background:white;
    min-width:180px;
    border-radius: 3px;
    box-shadow: 0 1px 3px black(0.35);
    list-style-type: none;
    padding: 5px 0;
  }

  // menu item

  .menu-item{
    position: relative;
    margin-bottom: 0px;
    padding: 5px 10px;

    // hover

    &:hover{
      background: black(0.05);
      &>.menu-child-items{
        display: block;
      }
    }

    // indicator for menu items with children

    &.menu-item-has-children{
      .menu-items-toggle{
        display: block;
      }
      .menu-icon-collapse{
        display: none;
      }
      .menu-icon-expand{
        position: relative;
        right: -5px;
        opacity: 0.5;
      }
    }

  }

  .menu-item-label{
    display: block;
    width: 100%;
  }
  .menu-child-items{
    top: -5px;
    left: 100%;
  }

}