discourse/app/assets/stylesheets/common/base/menu-panel.scss

.menu-panel.slide-in {
  position: fixed;
  right: 0;
  box-shadow: shadow("header");
  &.animate {
    transition: right 0.2s ease-out, left 0.2s ease-out;
  }

  .panel-body {
    position: absolute;
    top: 3px;
    bottom: 37px;
    width: 97%;
  }
}
.header-cloak {
  display: none;
}

.menu-panel.drop-down {
  position: absolute;
  // positions are relative to the .d-header .panel div
  top: 100%; // directly underneath .panel
  right: -10px; // 10px to the right of .panel - adjust as needed
}

.menu-panel {
  border: 1px solid $primary-low;
  box-shadow: shadow("menu-panel");
  background-color: $secondary;
  z-index: z("header");
  padding: 0.5em;
  width: 300px;

  hr {
    margin: 3px 0;
  }

  .panel-header {
    position: absolute;
    right: 20px;
  }

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

  .panel-body {
    touch-action: pan-y pinch-zoom;
    overflow-y: auto;
    overflow-x: hidden;
  }

  .badge-notification {
    vertical-align: text-bottom;
  }
}

.menu-links.columned {
  li {
    width: 50%;
    float: left;
  }
}

.menu-panel {
  li,
  li.heading {
    a.widget-link {
      padding: 0.25em 0.5em;
      display: block;
      &:hover,
      &:focus {
        background-color: $highlight-medium;
        outline: none;
      }
    }

    .new {
      font-size: $font-down-1;
      margin-left: 0.5em;
      color: dark-light-choose($primary-medium, $secondary-medium);
    }
  }

  li.category-link {
    float: left;
    background-color: transparent;
    display: inline-flex;
    align-items: center;
    padding: 0.25em 0.5em;
    width: 50%;
    box-sizing: border-box;
    a {
      display: inline-flex;
      &:hover,
      &:focus {
        background: transparent;
      }
    }
    .badge-notification {
      color: dark-light-choose($primary-medium, $secondary-medium);
      background-color: transparent;
      display: inline;
      padding: 0;
      font-size: $font-down-1;
      line-height: $line-height-large;
    }
    .badge-wrapper {
      overflow: hidden;
      text-overflow: ellipsis;
      &.bar,
      &.bullet {
        color: $primary;
        padding: 0 0 0 0.15em;
      }
      &.box {
        color: $secondary;
        + a.badge.badge-notification {
          padding-top: 2px;
        }
        span {
          z-index: z("base") * -1;
        }
      }
    }
  }

  // note these topic counts only appear for anons in the category hamburger drop down
  b.topics-count {
    color: dark-light-choose($primary-medium, $secondary-medium);
    font-weight: normal;
    font-size: $font-down-1;
  }

  span.badge-category {
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  div.discourse-tags {
    font-size: $font-down-1;
  }
}

.user-menu {
  .quick-access-panel {
    width: 100%;
    display: table;

    h3 {
      padding: 0 0.4em;
      font-weight: bold;
      margin: 0.5em 0;
    }

    .d-icon,
    &:hover .d-icon {
      color: $primary-medium;
    }
    .icon {
      color: $primary-high;
    }
    li {
      background-color: $tertiary-low;

      // This is until other languages remove the HTML from within
      // notifications. It can then be removed
      div .fa {
        display: none;
      }

      span:first-child {
        color: $primary;
      }

      &:hover,
      &:focus {
        background-color: $highlight-medium;
        outline: none;
      }

      a {
        padding: 0;
        > div {
          overflow: hidden; // clears the text from wrapping below icons

          // Truncate items with more than 2 lines.
          display: -webkit-box;
          -webkit-line-clamp: 2;
          -webkit-box-orient: vertical;
        }
      }

      p {
        margin: 0;
        overflow: hidden;
      }
    }
    li:not(.show-all) {
      padding: 0.25em 0.5em;
      .d-icon {
        float: left;
        margin-right: 5px;
        padding-top: 0.2em;
      }
    }
    .is-warning {
      .d-icon-far-envelope {
        color: $danger;
      }
    }
    .read {
      background-color: $secondary;
    }
    .none {
      padding-top: 5px;
    }
    .spinner-container.visible {
      min-height: 30px;
    }
    .spinner {
      width: 20px;
      height: 20px;
      border-width: 2px;
      margin: 0 auto;
    }
    .show-all a {
      width: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 30px;
      color: dark-light-choose($primary-medium, $secondary-high);
      background: blend-primary-secondary(5%);
      &:hover {
        color: $primary;
        background: dark-light-diff($primary, $secondary, 90%, -80%);
      }
    }
    /* as a big ol' click target, don't let text inside be selected */
    @include unselectable;
  }

  .dismiss-link {
    display: inline-block;
    float: right;
  }
}

div.menu-links-header {
  width: 100%;
  display: table;
  border-collapse: separate;
  border-spacing: 0 0.5em;
  .menu-links-row {
    border-bottom: 1px solid dark-light-choose($primary-low, $secondary-medium);
    display: flex;

    // Tabs should have "ears".
    padding: 0 4px;

    li {
      display: inline-flex;
      align-items: center;
      flex-wrap: wrap;
      &.user {
        margin-right: auto;
      }
      &.glyphs {
        flex-wrap: wrap;
        text-align: right;
        max-width: 65%; //IE11

        a {
          // Expand the click area a bit.
          padding-left: 0.6em;
          padding-right: 0.6em;
        }
      }

      a {
        // This is to make sure active and inactive tab icons have the same
        // size. `box-sizing` does not work and I have no idea why.
        border: 1px solid transparent;
        border-bottom: 0;
      }

      a.active {
        border: 1px solid dark-light-choose($primary-low, $secondary-medium);
        border-bottom: 0;
        position: relative;

        &:after {
          display: block;
          position: absolute;
          top: 100%;
          left: 0;
          z-index: z("header") + 1; // Higher than .menu-panel
          width: 100%;
          height: 0;
          content: "";
          border-top: 1px solid $secondary;
        }

        &:focus,
        &:hover {
          background-color: inherit;
        }
      }
    }
  }
  a:hover,
  a:focus {
    background-color: $highlight-medium;
    outline: none;
  }
  a {
    padding: 0.3em 0.5em;
  }
  a.user-activity-link {
    align-items: center;
    display: flex;
    margin: -0.5em 0;
    max-width: 130px;

    // `overflow: hidden` on `.user-activity-link` would hide the `::after`
    // pseudo element (used to create the tab-looking effect). Sets `overflow:
    // hidden` on the child username label instead.
    overflow: visible;

    span.d-label {
      display: block;
      max-width: 130px;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    @include breakpoint(mobile-medium) {
      max-width: 125px;
    }
  }
  li {
    display: table-cell;
    width: auto;
    text-align: center;
  }
  li:first-child {
    text-align: left;
  }

  li:last-child {
    text-align: right;
  }
  .fa,
  a {
    color: dark-light-choose($primary-medium, $secondary-medium);
  }

  .d-icon-user {
    margin-right: 0.475em;
  }
}