nightTab/css/menu.css

.menu {
  padding: 1em;
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  height: 80vh;
  transform: translateY(calc(-100% - 2em));
  transition: transform var(--animation-speed-fast) ease-in-out;
  z-index: var(--z-index-menu);
  pointer-events: none;
}

.menu:focus {
  outline: none;
}

.is-menu-open .menu {
  transform: translateY(0);
}

.menu-area {
  background-color: rgb(var(--gray-01));
  border-radius: var(--radius);
  width: 100%;
  height: 100%;
  overflow-y: auto;
  pointer-events: all;
  transition: background-color var(--animation-speed-fast) ease-in-out;
}

.menu-nav {
  display: flex;
  flex-direction: column-reverse;
  flex-direction: row;
}

.menu-nav-area {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: flex-start;
}

.menu-nav-area-grow {
  flex-grow: 1;
}

.menu-nav:not(:last-child) {
  margin: 0;
}

.menu-content {
  padding-bottom: 40vh;
}

.menu-content-area {
  display: grid;
  grid-template-columns: 1fr;
}

.menu-item {
  padding: 2em;
  position: relative;
  z-index: 1;
}

.menu-item:not(:last-child) {
  border-bottom: var(--menu-border);
}

.menu-close {
  background-color: transparent;
  margin: 0;
  padding-top: 0.75em;
  padding-bottom: 0.75em;
  border-radius: 0 var(--radius) 0 0;
}

.menu-nav-button {
  background-color: transparent;
  margin: 0;
  padding-top: 1em;
  padding-bottom: 1em;
  border-radius: 0;
  flex-grow: 1;
  flex-basis: 33%;
}

.menu-nav-button:first-child {
  border-radius: var(--radius) 0 0 0;
}

.menu-nav-button [class^="icon-"],
.menu-nav-button [class*=" icon-"] {
  line-height: 1;
  padding-top: 1.5em;
  padding-bottom: 1.5em;
}

@media (min-width: 550px) {
  .menu-nav-button {
    flex-basis: 0;
  }
}

@media (min-width: 700px) {
  .menu {
    width: 90vw;
    height: 100%;
    overflow-y: inherit;
    max-height: inherit;
  }

  .menu-area {
    overflow-y: inherit;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    grid-column-gap: 0px;
    grid-row-gap: 0px;
    justify-items: stretch;
    align-items: stretch;
  }

  .menu-content {
    overflow-y: auto;
  }

  .menu-content-area {
    grid-template-columns: repeat(2, 1fr);
    grid-gap: 4em;
    padding: 2em;
  }

  .menu-item:not(:last-child) {
    border-bottom: 0;
  }

  .menu-item:nth-child(odd):after {
    content: "";
    width: 0;
    height: 100%;
    position: absolute;
    top: 0;
    right: calc(-2em - calc(var(--menu-border-width) / 2));
    border-radius: 1em;
    border-right: var(--menu-border);
  }

  .menu-item:not(:nth-last-child(2)):not(:last-child):before {
    content: "";
    width: 100%;
    height: 0;
    position: absolute;
    left: 0;
    bottom: calc(-2em - calc(var(--menu-border-width) / 2));
    border-radius: 1em;
    border-bottom: var(--menu-border);
  }

  .menu-item {
    padding: 1em 0;
  }
}

@media (min-width: 900px) {
  .menu {
    width: 80vw;
  }
}

@media (min-width: 1600px) {
  .menu {
    width: 70vw;
  }

  .menu-content-area {
    grid-template-columns: repeat(3, 1fr);
  }

  .menu-item:nth-child(odd):after {
    content: none;
  }

  .menu-item:not(:nth-child(3n+3)):after {
    content: "";
    width: 0;
    height: 100%;
    position: absolute;
    top: 0;
    right: calc(-2em - calc(var(--line-width) / 2));
    border-radius: 1em;
    border-right: var(--menu-border);
  }

  .menu-item:not(:nth-last-child(2)):not(:last-child):before {
    content: none;
  }

  .menu-item:not(:nth-last-child(1)):not(:nth-last-child(2)):not(:nth-last-child(3)):before {
    content: "";
    width: 100%;
    height: 0;
    position: absolute;
    left: 0;
    bottom: calc(-2em - calc(var(--line-width) / 2));
    border-radius: 1em;
    border-bottom: var(--menu-border);
  }
}