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CSS-tricks Targeting Menu Elements with Submenus in a Navigation Bar

https://css-tricks.com/targetting-menu-elements-submenus-navigation-bar/

Ray Messina on Apr 13, 2017

nav {
  display: block;
  text-align: center;
}
nav ul {
  margin: 0;
  padding:0;
  list-style: none;
}
.nav a {
  display:block; 
  background: #111; 
  color:#fff; 
  text-decoration: none;
  padding: .8em 1.8em;
  text-transform: uppercase;
  font-size: 80%;letter-spacing: 2px;
  text-shadow: 0 -1px 0 #000;
  position: relative;
}
.nav{  
  vertical-align: top; 
  display: inline-block;
  box-shadow: 1px -1px -1px 1px #000, -1px 1px -1px 1px #fff, 0 0 6px 3px #fff;
  border-radius:6px;
}
.nav li{position: relative;}
.nav > li { 
  float:left; 
  border-bottom: 4px #aaa solid; 
  margin-right: 1px; 
} 
.nav > li > a { 
  margin-bottom:1px;
  box-shadow:inset 0 2em .33em -.5em #555; 
}
.nav > li:hover , .nav > li:hover >a{  border-bottom-color:orange;}
.nav li:hover > a { color:orange; }
.nav > li:first-child  { border-radius: 4px 0 0 4px;} 
.nav > li:first-child>a{border-radius: 4px 0 0 0;}
.nav > li:last-child  { 
  border-radius: 0 0 4px 0; 
  margin-right: 0;
} 
.nav > li:last-child >a{border-radius: 0 4px 0 0; }
.nav li li a { margin-top:1px}

.nav li a:first-child:nth-last-child(2):before { 
  content:""; 
  position: absolute; 
  height:0; 
  width: 0; 
  border: 5px solid transparent; 
  top: 50% ;
  right:5px;  
}

/* submenu positioning*/
.nav ul {
  position: absolute;
  white-space: nowrap;
  border-bottom: 5px solid  orange;
  z-index: 1;
  left: -99999em;
}
.nav > li:hover > ul {
  left: auto;
  padding-top: 5px  ;
   min-width: 100%;
}
.nav > li li ul {  border-left:1px solid #fff;}

.nav > li li:hover > ul { 
/* margin-left: 1px */
  left: 100%;
  top: -1px;
}
/* arrow hover styling */
.nav > li > a:first-child:nth-last-child(2):before { 
  border-top-color: #aaa; 
}
.nav > li:hover > a:first-child:nth-last-child(2):before {
  border: 5px solid transparent; 
  border-bottom-color: orange; 
  margin-top:-5px
}
.nav li li > a:first-child:nth-last-child(2):before {  
  border-left-color: #aaa; 
  margin-top: -5px
}
.nav li li:hover > a:first-child:nth-last-child(2):before {
  border: 5px solid transparent; 
  border-right-color: orange;
  right: 10px; 
}

<nav>
  <ul class="nav">
    <li><a href="#">About</a></li>
    <li><a href="#">Portfolio</a>
      <ul>
        <li><a href="#">item</a></li>
        <li><a href="#">item</a></li>
        <li><a href="#">item</a></li>
        <li><a href="#">item</a></li>
      </ul>
    </li>
    <li><a href="#">Resume</a>
      <ul>
        <li><a href="#">item a lonng submenu</a></li>
        <li><a href="#">item</a>
          <ul>
            <li><a href="#">Ray</a></li>
            <li><a href="#">Veronica</a></li>
            <li><a href="#">Bushy</a></li>
            <li><a href="#">Havoc</a></li>
          </ul>
        </li>
        <li><a href="#">item</a></li>
        <li><a href="#">item</a></li>
      </ul>
    </li>
    <li><a href="#">Download</a></li>
    <li><a href="#">Rants</a>
      <ul>
        <li><a href="#">item</a></li>
        <li><a href="#">item</a></li>
        <li><a href="#">item</a></li>
        <li><a href="#">item</a></li>
      </ul>
    </li>
    <li><a href="#">Contact</a></li>
  </ul>
</nav>