body {
  display: flex;
  justify-content: center;
  align-items: center;

  height: 100vh;
  width: 100vw;

  margin: 0;
  padding: 0;

  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
}
button {
  border: none;
  outline: none;
  background-color: transparent;
  font-size: 2em;
}
button.menu {
  position: absolute;
  left: 1rem;
  top: 1rem;
}
.navigation,
.navigation::before,
.navigation::after,
.navigation ul {
  transition-duration: var(--duration);
  transition-property: transform, width, height;
  transition-timing-function: var(--transition-timing-function);
}
.navigation {
  --duration: 0.3s;
  --transition-timing-function: ease-in;
  --spend: 0.8;
  --span: 10%;

  position: fixed;
  left: 0px;
  top: 0px;

  height: 100%;
  width: 30rem;

  transition-delay: calc(var(--duration) * 0);

  transition-duration: 0s;
}
.navigation.hide {
  transition-delay: calc(var(--duration) * 3);

  transform: translateX(-100%);
}
.navigation::before {
  content: "";

  position: absolute;
  top: 0;

  display: block;
  width: 100%;
  height: 100%;
  z-index: -1;

  background-color: black;

  transition-delay: calc(var(--duration) * 1 * var(--spend));
}

.navigation.hide::before {
  transform: translateX(-100%);

  transition-delay: calc(var(--duration) * 2 * var(--spend));
}

.navigation::after {
  content: "";

  position: absolute;
  top: 0;

  display: block;
  width: calc(100% - var(--span));
  height: 100%;
  z-index: -1;

  background-color: red;

  transition-delay: calc(var(--duration) * 2 * var(--spend));
}
.navigation.hide:after {
  transform: translateX(-100%);

  transition-delay: calc(var(--duration) * 1 * var(--spend));
}
.navigation .logo {
  display: flex;
  justify-content: center;
  align-items: center;

  height: 6rem;
  width: 100%;
  font-size: 3em;
  font-weight: bold;
}
.navigation ul .close {
  position: absolute;
  right: 1rem;
  top: 1rem;
}
.navigation ul {
  position: absolute;
  top: 0;

  height: 100%;

  width: calc(100% - var(--span) * 2);

  margin: 0;
  padding: 0;

  list-style: none;
  border: 0;

  background-color: white;

  transition-delay: calc(var(--duration) * 3 * var(--spend));
}
.navigation.hide ul {
  transform: translate(-100%);

  transition-delay: calc(var(--duration) * 0 * var(--spend));
}
.navigation ul li {
  margin: 2rem 0;

  color: #000;
}
.navigation ul li a {
  padding: 0 2rem;

  text-decoration: none;
  font-size: 2em;
  color: #000;
}
.navigation ul li a:hover {
  color: #18a058;
}
@media screen and (max-width: 30rem) {
  .navigation {
    width: 100%;
    font-size: 0.8em;
    --span: 8%;
    transition: all 0.3s;
  }
}
@media screen and (max-width: 20rem) {
  .navigation {
    width: 100%;
    font-size: 0.5em;
    --span: 5%;
  }
}