@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,600&subset=latin,cyrillic);
*{box-sizing: border-box;}
body {
  margin: 0;
  font-family: 'Open Sans', sans-serif;
}
nav {background: #66cc66;height: 40px}
nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
nav a {
  text-decoration: none;
  display: block;
  transition: .3s linear;
  height: 40px
}
.topmenu > li {
  float: left;
  position: relative;
  border-left: 1px solid black;
}
.topmenu > li:first-child {border-left: 0;}
.topmenu > li > a {
  padding: 20px 30px;
  font-size: 12px;
  text-transform: uppercase;
  color: #FEFDFD;
  letter-spacing: 2px;
}
.topmenu > li > a.active,
.submenu a:hover {background: #66cc66}
.topmenu .fa,
.submenu .fa {
  margin-left: 5px;
  color: inherit;
}
.submenu {
  position: absolute;
  z-index: 5;
  min-width: 300px;
  background: #c6ecc6;
  border-top: 1px solid #CBCBCC;
  border-left: 1px solid #CBCBCC;
  border-right: 1px solid #CBCBCC;
  visibility: hidden;
  opacity: 0;
  transform-origin: 0% 0%;
  transform: rotateX(-90deg);
  transition: .3s linear;
}
.submenu li {position: relative;}
.submenu li a {
  color: #282828;
  padding: 10px 20px;
  font-size: 13px;
  border-bottom: 1px solid #CBCBCC;
}
.submenu .submenu {
  position: absolute;
  left: 100%;
  top: -1px;
  transition: .3s linear;
}
nav li:hover > .submenu {
  transform: rotateX(0deg);
  visibility: visible;
  opacity: 1;
}