@keyframes showNav {
  from {
    opacity: 0;
  }
  to {
    opacity: 0.7;
  }
}
#overlay {
  display: none;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  position: fixed;
  width: 100%;
  height: 100%;
  background-color: #000;
  z-index: 1000;
  transition: opacity 1s ease-out;
  opacity: 0;
}

#overlay.open {
  display: block;
  animation: showNav 250ms ease-in-out both;
}

#left-menu {
  position: fixed;
  height: 100%;
  left: -250px;
  top: 0;
  bottom: 0;
  width: 240px;
  background-color: #0451b1;
  overflow-y: auto;
  z-index: 1001;
  -moz-transition: 0.2s all ease;
  -o-transition: 0.2s all ease;
  -webkit-transition: 0.2s all ease;
  transition: 0.2s all ease;
}
#left-menu > ul {
  margin: 0px;
  padding: 20px;
  list-style: none;
}
#left-menu > ul:last-child {
  padding-top: 0px;
}
#left-menu > ul li a {
  color: #fff;
  display: block;
  border-bottom: 1px solid #2c3f76;
  font-family: "Roboto Condensed";
  padding: 10px 0;
}
#left-menu > ul li ul {
  padding-left: 10px;
}
#left-menu > ul > li > a {
  font-weight: bold;
  text-transform: uppercase;
}
#open-menu {
  display: block;
  line-height: 42px;
  color: #fff;
  font-size: 30px;
  position: absolute;
  right: 20px;
  text-align: center;
  width: 60px;
}

#left-menu.open {
  left: 0;
}

@media only screen and (min-width: 1025px) {
  #overlay {
    display: none !important;
    opacity: 0 !important;
  }

  #left-menu {
    left: -250px !important;
  }

  #open-menu {
    display: none;
  }
}