discourse/app/assets/stylesheets/common/base/sidebar-footer.scss

.sidebar-footer-wrapper {
  box-sizing: border-box;
  background: var(--d-sidebar-background);
  width: 100%;
  position: sticky;
  bottom: 0;

  .sidebar-footer-container {
    display: flex;
    align-items: stretch;
    position: relative;
    padding: 0.5em 0.8em;
    padding-bottom: max(env(safe-area-inset-bottom), 0.5em);
    &:before {
      // fade to make scroll more apparent
      position: absolute;
      content: "";
      display: block;
      height: 1.5em;
      top: -1.5em;
      left: -0.5em;
      right: -0.5em;
      width: calc(100% + 0.5em);
      pointer-events: none;
      background: linear-gradient(
        to bottom,
        rgba(var(--secondary-rgb), 0),
        rgba(var(--secondary-rgb), 1)
      );
    }
  }

  .sidebar-footer-link {
    display: inline-flex;
    align-items: center;
    height: 100%;
    font-size: var(--font-down-1);
    color: var(--d-sidebar-link-color);
    padding: 0 0.5em;
    &:hover,
    &:focus {
      background: var(--d-sidebar-highlight-background);
    }
  }

  .sidebar-footer-actions {
    margin-left: auto;
  }

  .sidebar-footer-actions-button.btn {
    background: transparent;
    border: none;
    padding: 0.25em 0.4em;

    .d-icon {
      font-size: var(--font-down-1);
      color: var(--d-sidebar-link-icon-color);
    }

    &:focus,
    &:hover {
      background: var(--d-sidebar-highlight-background);
      .d-icon {
        color: var(--d-sidebar-highlight-color);
      }
    }
  }
}