#nav {
  text-decoration: none;
  background:rgba(0,0,0,.0);
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;  
    display: flex;    
    -webkit-flex-direction: row ; 
    flex-direction: row ; 
    -webkit-flex-wrap: wrap ;
    flex-wrap: wrap ;
}
#nav ul {
  list-style: none;
  margin: 0;
  padding: 0em;
  line-height: 1;

}

#nav ul li {
  background:rgba(0,0,0,.0);
  display: inline-block;
  padding: .0em;
  margin: 0;

}

#nav ul li a {
  color: #ffffff;
  text-decoration: none;
  display: block;
  padding: 15px 25px;
  font-family : Century Gothic, 'Lato', Verdana, Arial, Helvetica, sans-serif;
  font-weight: 400;
  text-transform: uppercase;
  font-size: 18px;
  position: relative;
  -webkit-transition: color .25s;
  -moz-transition: color .25s;
  -ms-transition: color .25s;
  -o-transition: color .25s;
  transition: color .25s;
}

#nav ul li a:hover {
  color: rgba(231,230,221,.8);
}

#nav ul li a:hover:before {
  width: 100%;
}


#nav ul li a:before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 10px;/* Dicke des Streifens*/
  width: 0;
  background:rgba(0,0,0,.4);/* Farbe des Streifens*/
  -webkit-transition: width .25s;
  -moz-transition: width .25s;
  -ms-transition: width .25s;
  -o-transition: width .25s;
  transition: width .25s;
}



@media screen and (max-width: 768px) {

 #nav ul li {
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;  
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;

  }

#nav ul li a:hover {
	  color: #429d82;
}
  #nav ul li a {
    padding: 8px 25px;
    width: 100%;

    border-bottom: 0px solid #cecece;
  }

#nav ul li a:hover:before {/* Streifen mit 0px Dicke*/
  width: 0%;
}
}