#nav {
  width: 300px;
  height: 100%;
  position: fixed;
  top: 0;
  background-color: #313131;
  transform: translate3d(0,0,0);
  transition: 500ms transform ease-in-out;
}

.toggle#nav {
  transform: translate3d(-300px,0,0);
}

#nav ul{
  margin: 0px;
  padding: 0px;
  list-style: none;
}

#nav li {
  color: white;
  line-height: 2em;
  position: relative;
}

#nav li a {
  color: white;
  display: block;
  position: relative;
  text-decoration: none;
  padding: 10px;
  font-weight: 300;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  border-top: 0px solid #616161;
  border-bottom: 1px solid #616161;
  transition: all 0.3s ease-in-out;
  -webkit-transition: all 0.3s ease-in-out;
}

#nav li a:hover {
  background: #616161;
}

#toggle_button {
  display: block; 
  position: absolute;
  cursor: pointer;
  top: 10px;
  right: -55px;
  width: 45px;
  height: 8px;
  background: #fff;
}
#toggle_button:before {
  display: block;
  content:"";
  background-color: white;
  height: 8px;
  margin: 11px auto 0px;
  width: 45px;
}
#toggle_button:after {
  display: block;
 content:"";
  background-color: white;
  height: 8px;
  width: 45px;
  margin: 3px auto 0px;
}