* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  font-family: 'Calibri', sans-serif;
}

a { text-decoration: none; }

div#overlay { display: none; }

a#toggle {
  position: fixed;
  top: 10px;
  left: 10px;
  width: 40px;
  height: 33px;
  background-color: rgba(0, 0, 0, 0.4);
  text-align: center;
  color: white;
  display: none;
  transition: all ease-out 0.3s;
}

a#toggle i {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

main#content { padding: 10px; }

#menu {
  text-align: center;
  transition: all ease-out 0.3s;
  margin-top: 2px;
}

#menu a { color: white; }

#menu ul {
  margin: 0;
  padding: 0;
  background-color: #0E0E0E;
}

#menu ul li {
  display: inline-block;
  position: relative;
  background-color: #0E0E0E;
  box-shadow: 2px 2px 6px 0px rgba(0,0,0,0.4);
}

#menu ul li > a {
  display: inline-block;
  padding: 10px;
}

#menu ul li > a > i {
  margin-left: 15px;
  transition: all ease-out 0.3s;
  -webkit-transition: all ease-out 0.1s;
}

#menu ul li ul {
  display: none;
  position: absolute;
  top: 38px;
  width: 200px;
  text-align: left;
}

#menu ul li ul li { display: block; }

#menu ul li ul li a { display: block; }

#menu ul li:hover > a { background-color: #800000;color: #fff; }

#menu ul li ul li:hover > a { background-color: #800000;color: #0E0E0E; }

#menu ul li:hover > a > i { transform: rotateZ(90deg); }

#menu ul li:hover ul { display: block; }

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

a#toggle { 
  display: block;
  background-color: #0E0E0E;
  font-size: 28px;
  top: 6px;
}

main#content {
  margin-top: 40px;
  transition: all ease-out 0.3s;
  width: 100%;
}

#menu {
  position: fixed;
  margin-top: 10px;
  width: 250px;
  height: auto;
  top: 0;
  left: 0;
  overflow: hidden;
  overflow-y: auto;
  background-color: #0E0E0E;
  color: #fff;
  transform: translateX(-250px);
}

#menu ul {
  text-align: left;
  background-color: transparent;
}

#menu ul li { 
  display: block; 
}

#menu ul li a { display: block; }

#menu ul li a > i { float: right; }

#menu ul li ul {
  display: none;
  position: static;
  width: 100%;
  background-color: rgba(22,160,133, 0.2);
}

#menu ul li:hover > ul { display: none; }

#menu ul li:hover > a > i { transform: rotateZ(0); }

#menu ul li.open > a { background-color: rgba(100, 100, 100, 1.0); } /*clicked color */

#menu ul li.open > a > i { transform: rotateZ(90deg); }

#menu ul li.open > ul { display: block; }

div#overlay {
  display: block;
  visibility: hidden;
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: auto;
  background-color: rgba(0, 0, 0, 0.8);
  transition: all ease-out 0.3s;
  z-index: 9999;
  opacity: 0;
}

html.open-menu { overflow: hidden; }

html.open-menu div#overlay {
  visibility: visible;
  opacity: 1;
  width: calc(-150%);
  left: 250px;
}

html.open-menu a#toggle,
 html.open-menu main#content { transform: translateX(250px);}

html.open-menu nav#menu {
  z-index: 9999;
  transform: translateX(0);
}
}