nav {
  display: flex;
  flex-direction: column;
}

.current {
  color: var(--theme-highlight-color);
}

@media only screen and (max-width: $horizontal_breakpoint),
  only screen and (max-height: $vertical_breakpoint) {
  nav.page-table-of-contents {
    white-space: normal;
    justify-content: left;
    text-align: left;
    ul {
      padding-left: 0em;
    }
    li li {
      padding-right: 0em;
      padding-left: 2em;
    }
  }
}