css - Applying &:before to top level of menu only -

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i have following html structure cannot edit:

<div id="menu">   <ul class="nav nav-pills nav-stacked">     <li class="active"><a href="#">home</a>       <ul class="sub-menu">         <li class="active"><a href="#">home</a></li>         <li><a href="#">profile</a></li>         <li><a href="#">messages</a></li>       </ul>     </li>     <li><a href="#">profile</a></li>     <li><a href="#">messages</a></li>   </ul> </div>

i using sass style triangle inserted before text inside link:

#menu{   width:300px;   .nav li{     a{     border-bottom: 1px solid #ededde;                 &:before {                 content: "";                 display: inline-block;                 width: 0;                  height: 0;                  border-top: 4px solid transparent;                 border-bottom: 4px solid transparent;                 border-left: 4px solid #333;                 margin-left: 5px;                 margin-right: 5px;                 position: relative;             }   }   }    .sub-menu {     list-style:none;     padding-left: 30px;     border-bottom: 0;   } }

codepen bootstrap added here: http://codepen.io/guerrillacoder/pen/jpbmqg?editors=110

the effect desire inserted in top level of menu, , if class "active" there triangle point down instead of right.

i going round in circles, cannot figure out how either remove inserted content, hide or alter selector top level. trying stop underline spilling sub-menu.

can give me tips?

you should apply generic rules (the ones can/will affect :after pseudo-element of time) .nav a selector (which broad selector, covering a elements in .nav).

then, specific in targeting ones want special behviour:

  .nav{     a{       border-bottom: 1px solid #ededde;         &:before {         display: inline-block;         width: 0;          height: 0;          margin-left: 5px;         margin-right: 5px;         position: relative;        }     }     & > li > a:before {         content: "";         border-top: 4px solid transparent;         border-bottom: 4px solid transparent;         border-left: 4px solid #333;     }     & > li.active a:before {         border-top: 4px solid #333;         border-right: 4px solid transparent;         border-left: 4px solid transparent;     }

i've used descendant selectors ensure direct children of top level affected.

full example:

http://codepen.io/anon/pen/voxxpg


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