discourse/app/assets/stylesheets/common/components/keyboard_shortcuts.scss

.topic-list-item td:first-child,
.topic-post {
  border-left: 1px solid transparent;
}

.topic-list tr.selected td:first-child,
.topic-list-item.selected td:first-child,
.latest-topic-list-item.selected,
.search-results .fps-result.selected {
  box-shadow: inset 3px 0 0 $danger; // needs to be inset for Edge
}

.featured-topic.selected,
.topic-post.selected {
  box-shadow: -3px 0 0 $danger;
}

.latest .featured-topic {
  padding-left: 4px;
}

.topic-list-item.selected {
  background-color: inherit;
}

.keyboard-shortcuts-modal .modal-body {
  max-height: 560px;
}

.keyboard-shortcuts-modal .modal-inner-container {
  max-width: 880px;
}

#keyboard-shortcuts-help {
  display: flex;

  .column {
    width: 33.3%;
  }

  ul {
    list-style: none;
    margin-bottom: 2rem;
    margin-left: 0;

    li {
      align-items: center;
      display: flex;
      flex-wrap: wrap;
      margin-bottom: 6px;
    }

    span {
      background: #f2f2f2;
      border-radius: 3px;
      display: inline-flex;
      margin: 0 6px;
      padding: 1px 0 5px;
    }

    span:first-child {
      margin-left: 0;
    }

    kbd {
      align-items: center;
      box-sizing: border-box;
      color: dark-light-choose(#333, #aaa);
      display: inline-flex;
      font-family: $base-font-family;
      font-weight: bold;
      height: 24px;
      justify-content: center;
      margin: 0 3px;
      min-width: 24px;
      padding: 0 6px;
      vertical-align: bottom;
      white-space: nowrap;
    }
  }
}