strong {
  font-weight: 600;
}

nav {
  position: fixed;
  height: 100vh;
  width: 100%;
  pointer-events: none;
  z-index: 999;
}
nav .bg {
  position: absolute;
  top: 70px;
  left: 0;
  width: 100%;
  height: calc(100% - 70px);
  visibility: hidden;
  opacity: 0;
  transition: .3s;
  background: #000;
}
nav:focus-within .bg {
  visibility: visible;
  opacity: .6;
}
nav * {
  visibility: visible;
}

nav .button {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  z-index: 1;
  -webkit-appearance: none;
  border: 0;
  background: transparent;
  border-radius: 0;
  height: 70px;
  width: 30px;
  cursor: pointer;
  pointer-events: auto;
  margin-left: 25px;
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  padding: 0;
}

nav .icon-bar {
  display: block;
  width: 100%;
  height: 3px;
  background: #aaa;
  transition: .3s;
}
nav .icon-bar + .icon-bar {
  margin-top: 5px;
}

nav:focus-within .button {
  pointer-events: none;
}
nav:focus-within .icon-bar:nth-of-type(1) {
  transform: translate3d(0,8px,0) rotate(45deg);
}
nav:focus-within .icon-bar:nth-of-type(2) {
  opacity: 0;
}
nav:focus-within .icon-bar:nth-of-type(3) {
  transform: translate3d(0,-8px,0) rotate(-45deg);
}

#nav-content {
  margin-top: 70px;
  padding: 20px;
  width: 90%;
  max-width: 300px;
  position: absolute;
  top: 0;
  left: 0;
  height: calc(100% - 70px);
  background: #ececec;
  pointer-events: auto;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  transform: translateX(-100%);
  transition: transform .3s;
  will-change: transform;
  contain: paint;
}

#nav-content ul {
  height: 100%;
  display: flex;
  flex-direction: column;
}

#nav-content li a {
  padding: 10px 5px;
  display: block;
  text-transform: uppercase;
  transition: color .1s;
}

#nav-content li a:hover {
 color: rgba(179,19,25,1)
}

#nav-content li:not(.small) + .small {
  margin-top: auto;
}

nav .small {
  display: flex;
  align-self: center;
}

nav .small a {
  font-size: 12px;
  font-weight: 400;
  color: #888;
}
nav .small a + a {
  margin-left: 15px;
}

nav:focus-within #nav-content {
  transform: none;
}